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Unterstützte Formate
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Webformate
Joint Photographic Experts Group - the most universal image format for photographs using lossy compression. Reduces file sizes 90-95% with minimal visible quality loss. No transparency support. Perfect for photos, web images, email attachments, and any scenario requiring small file sizes. Adjustable quality levels from 1-100. Standard since 1992 with universal device and software support. Ideal for photographs and complex images with many colors.
Portable Network Graphics - lossless image format supporting transparency and 16 million colors. Larger files than JPEG but perfect quality preservation. Supports alpha channel for smooth transparency. Excellent for logos, graphics with text, screenshots, and images requiring transparency. Better compression than GIF for photos. Perfect for web graphics, UI elements, and any image needing lossless quality or transparency. Standard format for web graphics since 1996.
Web Picture format - modern image format by Google providing 25-35% smaller files than JPEG at equivalent quality. Supports both lossy and lossless compression plus transparency. Superior compression algorithms reducing bandwidth usage. Native browser support (96%+ coverage). Perfect for website optimization, web images, and reducing page load times. Combines best features of JPEG, PNG, and GIF. Recommended for modern web development.
Graphics Interchange Format - image format supporting animation and transparency with 256-color limitation. Small file sizes for simple images. Perfect for simple animations, emojis, memes, and graphics with few colors. Lossless for limited palette. Inefficient for photographs (use JPEG) or high-color graphics (use PNG). Universal support since 1987. Standard format for simple web animations and reaction images.
Scalable Vector Graphics - XML-based vector format rendering perfectly at any size. Infinitely scalable without quality loss or pixelation. Small file sizes for geometric shapes and illustrations. Editable with text editors and design software. Perfect for logos, icons, diagrams, and graphics requiring scaling. Supports animation and interactivity. Standard for responsive web graphics and resolution-independent designs. Essential format for modern web icons.
Icon File Format - specialized format for Windows icons containing multiple image sizes (16x16 to 256x256 pixels). Single file provides icons for all display resolutions. Used for favicons, application icons, and Windows shell icons. Supports transparency and multiple color depths. Perfect for website favicons, Windows program icons, and shortcut icons. Standard format for Windows icons since Windows 1.0. Essential for professional Windows applications.
AV1 Image File Format - next-generation image format based on AV1 video codec providing better compression than WebP and JPEG. 20-50% smaller files at equivalent quality. Supports HDR, wide color gamut, and transparency. Cutting-edge compression technology. Growing browser support (85%+ and increasing). Perfect for future-proof web images and maximum efficiency. Better quality at smaller sizes than any previous format. Recommended for modern websites prioritizing performance.
Bitmap Image File - uncompressed raster format from Microsoft providing pixel-perfect quality with large file sizes. No compression means huge files (1MB+ for screenshots). Fast to load and display. Simple format with universal Windows support. Perfect for temporary graphics, screen captures, and scenarios where compression artifacts are unacceptable. Legacy format largely replaced by PNG. Convert to PNG or JPEG for practical use and storage.
Tagged Image File Format - flexible format supporting multiple pages, layers, and various compression methods. Industry standard for professional photography, publishing, and archival. Supports lossless compression, 16-bit color depth, and extensive metadata. Large file sizes but excellent quality. Perfect for print publishing, photo archival, professional photography, and scenarios requiring maximum quality and flexibility. Used in medical imaging and professional scanning.
Professionelle Formate
Photoshop Document - Adobe Photoshop's native format preserving layers, effects, masks, and all editing capabilities. Supports 16-bit and 32-bit color depths for professional work. Large file sizes due to layer data and editing information. Perfect for ongoing design projects, professional photo editing, and collaborative design work. Not suitable for final output (export to JPEG/PNG). Essential format for professional graphic design and photo manipulation workflows. Industry standard for design files.
OpenEXR - high dynamic range image format developed by Industrial Light & Magic for visual effects and animation. Stores 16-bit or 32-bit floating-point values per channel enabling enormous dynamic range. Supports multiple layers, arbitrary channels, and lossless/lossy compression. Industry standard for VFX, CGI, and professional 3D rendering. Perfect for HDR photography, compositing, and scenarios requiring maximum color precision. Used extensively in film production and high-end visual effects.
High Dynamic Range Image - format storing luminance and color information with greater range than standard images. Captures and displays brightness levels impossible in JPEG/PNG. Uses 32-bit floating-point encoding. Perfect for realistic lighting in 3D rendering, environment maps, and HDR photography. Common in game development and architectural visualization. Enables realistic tone mapping and exposure adjustment. Essential for professional lighting workflows.
DirectDraw Surface - Microsoft texture format for games and 3D applications supporting compressed textures and mipmaps. Optimized for GPU loading with hardware-accelerated decompression. Stores multiple resolution levels (mipmaps) in single file. Standard format for game textures (DirectX, Unity, Unreal). Supports various compression algorithms (DXT1, DXT5, BC7). Perfect for game development, 3D modeling, and real-time rendering. Essential format for game asset pipelines.
Truevision TGA/Targa - raster graphics format supporting 8-32 bits per pixel with alpha channel. Uncompressed or RLE compressed for fast loading. Standard format for video editing, animation, and texture mapping. Excellent color accuracy with optional lossless compression. Perfect for video frame sequences, animation frames, and game textures. Widely supported in 3D software and video editing applications. Reliable format for professional media production.
JPEG 2000 - advanced image format using wavelet compression providing better quality than JPEG at equivalent file sizes. Supports lossless and lossy compression, progressive decoding, and ROI coding. Used in medical imaging, digital cinema, and archival. Better compression artifacts than JPEG. Slower encoding/decoding. Perfect for medical imaging, digital preservation, and applications requiring superior compression. Limited web browser support.
JPEG Stereo - stereoscopic 3D image format storing left and right eye views side-by-side or top-bottom. Based on standard JPEG with special arrangement for 3D viewing. Used for 3D photography, VR content, and stereoscopic displays. Compatible with 3D TVs and VR headsets. Perfect for 3D photography, stereoscopic content creation, and VR/AR applications. Requires special viewing equipment for proper 3D effect.
Portable Float Map - floating-point image format storing HDR color data. Simple format with 32-bit float values per channel. Used in computer graphics for HDR images and height maps. Uncompressed format with large file sizes. Perfect for HDR photography processing, displacement maps, and scientific imaging. Common in 3D rendering and simulation applications. Alternative to OpenEXR for simple HDR storage.
Flexible Image Transport System - scientific image format used primarily in astronomy. Stores astronomical images with extensive metadata headers. Supports multiple data arrays and tables. Standard format for astronomical data archives. Perfect for astronomical imaging, scientific data exchange, and research applications. Used by major observatories and space agencies worldwide. Essential format for astronomical research and data sharing.
Mobile Formate
High Efficiency Image Container - Apple's modern image format using HEVC compression providing 50% smaller files than JPEG at equivalent quality. Default format for iOS photos since iOS 11. Supports HDR, transparency, and image sequences. Excellent quality with tiny file sizes. Limited compatibility outside Apple ecosystem. Convert to JPEG for broad sharing. Perfect for iOS photography and Apple device storage optimization. Future-oriented format gaining broader support.
High Efficiency Image Format - container format using HEVC or other compression methods. More versatile than HEIC supporting various codecs. Supports image sequences, burst photos, and depth maps. Used by Apple devices and modern cameras. Better compression than JPEG with smaller file sizes. Perfect for modern photography, image sequences, and efficient storage. Growing support across platforms and devices.
Joint Photographic Experts Group - standard JPEG variant with .jpeg extension instead of .jpg. Identical format and capabilities to JPG files. Same lossy compression and universal compatibility. Used interchangeably with .jpg extension. Perfect for all scenarios where JPG is appropriate. No technical difference from JPG format. Extension preference varies by platform and tradition.
JPEG Image - alternative JPEG file extension used less commonly than .jpg or .jpeg. Identical format and compression to standard JPEG. Full compatibility with all JPEG-supporting software. Occasionally used by older Windows systems. Perfect for any JPEG use case. Convert to .jpg for broader recognition. No technical differences from standard JPEG format.
JPEG File Interchange Format - JPEG variant with specific structure for data exchange. Standard way to encode JPEG for maximum compatibility. Includes specific header markers and color space definitions. Ensures consistent JPEG interpretation across platforms. Perfect for reliable JPEG exchange and archival. Most JPEGs actually use JFIF structure. Technical specification ensuring JPEG interoperability.
JPEG File Interchange - alternative extension for JFIF-compliant JPEG files. Same format and capabilities as standard JPEG/JFIF. Used occasionally by specific software and systems. Perfect compatibility with all JPEG viewers. Perfect for any JPEG application. Consider using .jpg for better recognition. Functionally identical to standard JPEG format.
JPEG Interchange Format - another extension variant for JPEG images. Identical compression and structure to standard JPEG. Full compatibility with JPEG software. Rarely used compared to .jpg extension. Perfect for standard JPEG use cases. Rename to .jpg for universal recognition. No technical distinction from regular JPEG files.
Rohformate
Raw RGB - uncompressed raw red-green-blue color data without headers or metadata. Pure pixel data requiring width/height specification for viewing. Maximum quality with enormous file sizes. Used in image processing pipelines and professional workflows. Perfect for image processing intermediates, scientific imaging, and maximum quality requirements. Requires external dimension information. Essential for professional image manipulation workflows.
Raw RGBA - uncompressed RGB data with alpha channel for transparency. Four channels (red, green, blue, alpha) without compression. Requires dimension specification for proper viewing. Huge file sizes due to no compression. Perfect for image processing with transparency, compositing workflows, and professional graphics. Used in video production and game development. Maximum quality preservation with alpha information.
RGB with Opacity - variant of RGB format including opacity/transparency information. Uncompressed pixel data with alpha channel. Used in specific graphics workflows and professional software. Requires external dimension data. Perfect for professional compositing, graphics production, and transparency workflows. Alternative to RGBA in some applications. Maintains maximum quality with transparency.
Raw Graphics Format - uncompressed raw image data used in specific professional workflows. Simple binary format without metadata headers. Requires dimension and color space information for proper viewing. Used in specialized imaging applications and scientific software. Perfect for image processing pipelines, scientific imaging, and professional graphics workflows. Maximum quality with minimal file structure.
YUV Color Space - raw format storing luminance (Y) and chrominance (U, V) separately. Used extensively in video processing and broadcast. More efficient than RGB for human vision. Common in video codecs and professional video equipment. Perfect for video frame extraction, broadcast workflows, and video processing. Essential format in television and video production. Enables efficient compression in video codecs.
UYVY Color Format - packed YUV format with specific byte ordering (U, Y, V, Y). Common in video capture and professional video equipment. Interleaved chroma and luma for efficient processing. Used by video capture cards and cameras. Perfect for video frame processing, capture workflows, and broadcast applications. Standard format in professional video equipment. Optimized for hardware video processing.
Unix Formats
X PixMap - ASCII-based image format for X Window System icons. Human-readable C source code format. Simple format for small icons and cursors. Used primarily on Unix/Linux systems. Perfect for X Window icons, cursors, and small graphics on Unix systems. Can be compiled directly into programs. Legacy format still found in Linux applications.
X BitMap - monochrome bitmap format for X Window System. ASCII format representing black and white images. Used for cursors, icons, and simple graphics on Unix/Linux. Very small file sizes for 1-bit images. Perfect for X Window cursors, monochrome icons, and simple Unix graphics. C language header file format. Historic Unix/Linux bitmap format.
X Window Dump - screen capture format for X Window System. Stores complete window or screen contents with color information. Native X11 format for screenshots and window captures. Includes X server-specific information. Perfect for X Window screenshots, Unix screen captures, and X11 debugging. Used primarily on Unix/Linux systems. Standard screenshot format for X-based systems.
XV Thumbnail - image format for XV image viewer on Unix systems. Used for thumbnail caches and quick previews. Simple format optimized for fast loading. Associated with the xv image viewer application. Perfect for XV image viewer thumbnails and Unix image browsing. Legacy format from classic Unix graphics software. Found in older Unix image management systems.
Sun Raster - image format from Sun Microsystems for SunOS and Solaris systems. Supports various color depths and compression methods. Standard format on Sun workstations and servers. Used extensively in scientific and engineering applications on Sun systems. Perfect for legacy Sun system compatibility and Solaris applications. Historical importance in Unix workstation graphics. Convert to modern formats for current use.
Silicon Graphics Image - professional image format from SGI workstations. Supports RGB and RGBA with RLE compression. Used extensively in computer graphics and visual effects. Standard format on SGI/IRIX systems. Perfect for legacy SGI compatibility, professional graphics workflows, and film production archives. Historical significance in 3D graphics evolution. Used in early CGI and digital effects.
Sun Raster Image - another extension for Sun Raster format. Same capabilities as .sun format. Used on Sun Microsystems systems and Solaris. Supports various color depths and optional RLE compression. Perfect for Sun/Solaris compatibility and legacy system support. Alternative extension to .sun files. Convert to modern formats for broader compatibility.
Portable Formate
Portable PixMap - simple uncompressed RGB format from Netpbm suite. Human-readable ASCII or binary format. Maximum portability across platforms. No compression leading to large files. Perfect for image processing intermediates, Unix graphics workflows, and maximum portability. Part of portable pixmap family. Extremely simple format ensuring universal compatibility.
Portable BitMap - monochrome format from Netpbm suite. ASCII or binary format for black and white images. Simplest possible image format. Perfect for monochrome graphics, fax images, and simple bitmap data. Extremely portable and easy to generate programmatically. Part of Netpbm image family. Used in document scanning and OCR workflows.
Portable GrayMap - grayscale format from Netpbm suite. ASCII or binary format for grayscale images. Simple structure ensuring maximum portability. No compression. Perfect for grayscale photography, scientific imaging, and image processing. Part of portable pixmap family. Used extensively in image processing education and research.
Portable Any Map - generic format encompassing PBM, PGM, and PPM. Automatically handles monochrome, grayscale, or color images. Most flexible Netpbm format. Perfect for general-purpose portable image storage and Unix graphics workflows. Universal format in Unix image processing. Enables format-agnostic image handling.
Portable Arbitrary Map - extended Netpbm format supporting alpha channels and arbitrary color depths. More capable than PBM/PGM/PPM with similar simplicity. Supports transparency and high bit depths. Perfect for modern portable image workflows with transparency. Extended Netpbm format for contemporary needs. Maintains Netpbm simplicity with modern features.
Legacy-Formate
PC Paintbrush - legacy DOS graphics format from ZSoft Corporation. Standard image format in DOS era (1980s-1990s). Supports various color depths and RLE compression. Common in early Windows applications. Perfect for DOS/early Windows compatibility and retro computing. Historical importance in PC graphics evolution. Convert to modern formats for current use.
Apple Picture - legacy Macintosh graphics format (Mac OS Classic). Supported both bitmap and vector graphics. Native format for Classic Mac applications. Obsolete with Mac OS X transition. Perfect for recovering images from vintage Mac systems. Historical format important for Mac archive access. Convert to modern formats for usability.
PICT Image - alternative extension for Apple PICT format. Same capabilities as .pict files. Used on Macintosh systems before Mac OS X. Supports bitmap and vector data. Perfect for Classic Mac compatibility and vintage system recovery. Alternative extension to .pict. Legacy format requiring conversion for modern use.
Kodak Photo CD - proprietary format for Kodak Photo CD system. Stores images at multiple resolutions in single file. Used by Kodak for photo scanning and archival services. Includes multiple resolution layers for different uses. Perfect for Photo CD archive access and Kodak imaging system compatibility. Legacy professional photography format. Historical importance in digital photography transition.
Palm Database Image - Palm OS format for storing images on Palm PDAs. Compressed format optimized for small devices. Used on Palm Pilot and related handhelds. Legacy format from PDA era (1990s-2000s). Perfect for Palm device compatibility and vintage PDA recovery. Historical format from handheld computing. Convert to modern formats for accessibility.
Palm Pixmap - bitmap format for Palm OS devices. Optimized for Palm handheld screens and memory limitations. Simple format with limited color depths. Used on Palm PDAs and early smartphones. Perfect for Palm OS compatibility and retro PDA applications. Legacy format from handheld era. Important for Palm device emulation and archival.
Windows Cursor - format for Windows mouse cursor images. Contains hotspot information defining click point. May include multiple sizes for different resolutions. Used for custom cursors in Windows applications. Perfect for Windows cursor design, custom mouse pointers, and UI development. Standard format for Windows cursors since Windows 1.0. Essential for Windows UI customization.
Spezialisierte Formate
VIPS Image - format for libvips image processing library. Supports large images and streaming operations. Optimized for efficient memory usage with huge images. Used in image processing pipelines and server-side imaging. Perfect for processing large images, batch operations, and memory-efficient workflows. Essential for server-side image processing. Specialized format for libvips ecosystem.
Visualization Image File Format - image format for Khoros visualization software. Supports various data types and multi-dimensional images. Used in scientific visualization and image processing research. Includes extensive metadata capabilities. Perfect for scientific imaging, visualization workflows, and research applications. Specialized format for Khoros system. Used in academic image processing.
Multiple-image Network Graphics - animated image format related to PNG. Supports animation with better compression than GIF. PNG-based animation format with advanced features. Limited browser support compared to GIF. Perfect for complex animations with transparency. Better quality than animated GIF. Superseded by APNG and WebP for most uses.
MTV Raytracer - image format for MTV raytracing software. Simple format for raytraced images. Used by MTV raytracer program on Unix systems. Academic and research format from computer graphics education. Perfect for MTV raytracer compatibility and computer graphics education. Specialized format from raytracing software. Legacy format from graphics research.
Wireless Bitmap - monochrome format for early mobile phones and wireless devices. Optimized for limited bandwidth and memory. Used in WAP (Wireless Application Protocol) era. Tiny file sizes for 1-bit images. Perfect for legacy mobile device compatibility. Historical format from early mobile web. Obsolete with modern smartphones.
JPEG 2000 Reference - format for JPEG 2000 development and testing. Simple format for individual image components. Used in JPEG 2000 codec development and testing. Perfect for JPEG 2000 research, codec testing, and format development. Specialized format for image compression research. Used in academic and standards work.
Palette File - color palette/colormap format used by various graphics software. Stores color lookup tables for indexed images. Used with indexed color images and sprite graphics. Perfect for game development, pixel art workflows, and indexed color management. Common in retro game development. Essential for palette-based graphics.
Colormap - another palette format storing color lookup tables. Used by various graphics applications for indexed colors. Defines available colors for indexed images. Perfect for indexed color workflows, game development, and palette management. Common in graphics software and game development tools. Used with palette-based image formats.
Fax- und Druckformate
Fax Image - format for fax machine documents. Monochrome format optimized for text documents. Uses efficient compression for black and white pages. Standard format for fax transmission and storage. Perfect for fax document archival, legacy fax system compatibility, and document scanning. Used in telecommunications and document management. Essential for fax machine compatibility.
CCITT Group 3 Fax - standard fax compression format (one-dimensional). Efficient compression for black and white documents. Standard for fax transmission worldwide. One-dimensional compression algorithm. Perfect for fax documents, scanned text pages, and telecommunications. Used in virtually all fax machines. Essential standard for fax communication.
CCITT Group 4 Fax - advanced fax compression format (two-dimensional). Better compression than G3 for text documents. Higher quality fax transmission. Two-dimensional compression for superior efficiency. Perfect for high-quality fax, document archival, and scanning workflows. Recommended fax format for quality and file size. Standard for modern fax systems.
JBIG - bilevel image compression standard for high-resolution black and white images. Superior compression to G3/G4 fax formats. Used in document scanning and archival. Progressive coding enabling resolution scaling. Perfect for high-resolution document scanning, archival imaging, and efficient black and white compression. Successor to G3/G4. Used in professional document management.
JBIG Image - alternative extension for JBIG compressed images. Same capabilities as .jbg format. Efficient bilevel compression for documents. Used in document imaging and scanning applications. Perfect for high-quality document compression, scanning workflows, and archival systems. Alternative extension to .jbg files. Professional document imaging format.
Retro-Formate
Sixel Graphics - bitmap format for DEC terminals and printers. Uses six-pixel vertical slices encoded as characters. Historic format from DEC terminal era (1970s-1980s). Enabled graphics on text-only terminals. Perfect for terminal graphics, retro computing, and DEC system compatibility. Legacy format with nostalgic significance. Used in terminal emulators for retro graphics.
SIX Format - alternative extension for Sixel graphics. Same capabilities as .sixel format. DEC terminal graphics format. Used for graphics on VT terminals. Perfect for DEC terminal compatibility and vintage system emulation. Alternative extension to .sixel files. Historical format from terminal graphics era.
Slow Scan TV - format for amateur radio slow-scan television. Transmits images over radio frequencies. Used in amateur radio for image transmission. Simple format optimized for radio transmission. Perfect for ham radio SSTV applications and radio image exchange. Specialized format for radio amateurs. Important in amateur radio communication.
IPLab Image - format for IPLab image analysis software. Used in scientific image processing and analysis. Supports various data types and metadata. Common in microscopy and scientific imaging. Perfect for IPLab software compatibility, scientific image analysis, and microscopy workflows. Specialized format for image analysis software. Used in scientific research.
Personal Icon - small icon format for email and newsgroups. 48x48 pixel images representing people in directories. Used in academic and early internet systems. Perfect for personal icon databases and vintage internet systems. Historical format from early internet era. Legacy format for academic systems.
On-the-air Bitmap - format for Nokia phones and wireless devices. Used in mobile phone applications and services. Simple bitmap format for limited devices. Perfect for Nokia device compatibility and vintage mobile applications. Legacy format from early mobile phones. Historical format from pre-smartphone era.
So konvertieren Sie Dateien
Laden Sie Ihre Dateien hoch, wählen Sie das Ausgabeformat aus und laden Sie die konvertierten Dateien sofort herunter. Unser Konverter unterstützt die Batch-Konvertierung und erhält die hohe Qualität.
Häufig gestellte Fragen
Was ist eine OTB-Datei und warum wurde dieses Format erstellt?
Eine OTB-Datei ist ein Bitmap-Bildformat, das hauptsächlich auf frühen Nokia-Mobiltelefonen und bestimmten anderen Geräten aus der GSM-Ära verwendet wird. "OTB" steht für Over-The-Air Bitmap und wurde entwickelt, um kleine monochrome Bilder, Anrufer-Icons und Betreiber-Logos über SMS oder Telefon-zu-Telefon-Übertragungen zu senden, lange bevor Smartphones existierten. Diese Geräte hatten extrem begrenzten Speicher, winzige Bildschirme und sehr grundlegende Grafikfähigkeiten, sodass OTB eine kompakte, effiziente Möglichkeit bot, einfache, ikon-große Bilder zu kodieren, die über schmalbandige Kommunikationskanäle übertragen werden konnten.
OTB wurde zu einem Grundformat in der Ära der Feature-Phones für die Personalisierung—kleine Bilder, die für Willkommensbildschirme, Anrufer-ID-Icons und Betreiber-Logos verwendet wurden. Seine Einfachheit stellte sicher, dass es schnell von leistungsschwachen Prozessoren mit minimalem RAM verarbeitet werden konnte. Heute überlebt es hauptsächlich in Retro-Mobiltelefon-Communities, Firmware-Archiven und digitalen Erhaltungsprojekten, die frühe mobile Technologie dokumentieren.
Wie ist eine OTB-Datei intern strukturiert?
OTB verwendet eine einfache binäre Struktur, die für monochrome mobile Anzeigegeräte optimiert ist:
Kompakter Header
Der Header enthält typischerweise Breite, Höhe, Kodierungstyp und manchmal Indexierungsinformationen oder Nokia-spezifische Flags.
Monochrome Bitmap-Kodierung
OTB-Bilder werden als 1-Bit-pro-Pixel-Bitmaps gespeichert, wobei die Pixel eng in Bytes gepackt sind, um die Dateigröße zu minimieren.
No Metadata System
OTB enthält keine EXIF-Daten, Zeitstempel, Farbprofile oder Orientierungsmetadaten—alles ist roh für maximale Effizienz.
Reihenbasierte Bit-Packing
Die Pixel werden in aufeinanderfolgenden Reihen gespeichert, wobei die Bits direkt den ein/aus-Bildschirm-Pixeln auf frühen mobilen LCDs entsprechen.
Das gesamte Design spiegelt eine Zeit wider, in der jedes Byte zählte und Geräte extrem eingeschränkte Grafikfähigkeiten hatten.
Wo werden OTB-Dateien heute noch verwendet?
Obwohl sie für moderne Smartphones obsolet sind, bleibt OTB in mehreren Nischenbereichen relevant:
Retro-Mobiltelefon-Communities
Sammler und Enthusiasten verwenden OTB häufig, wenn sie alte Nokia-Geräte restaurieren oder anpassen.
Firmware-Analyse
Mobile Technik-Historiker analysieren OTB-Ressourcen, die in frühen Telefon-Firmware-Images gefunden werden.
Emulatoren
Nokia-Telefon-Emulatoren verwenden OTB, um die Bildschirmgrafiken der Legacy-Geräte genau darzustellen.
Digitale Erhaltung
Archive, die frühe mobile Inhalte bewahren, enthalten oft OTB-Format-Betreiberlogos und Grüße.
Retro-Themenanwendungen
Einige Retro-Style-Apps replizieren frühe mobile Grafiken mit OTB-Bildern.
Eingebettete Systeme
Niedrigauflösende Geräte verwenden weiterhin ähnliche 1-Bit-Bitmap-Strukturen, die OTB-Layouts ähneln.
SMS-Dekodierungstools
Alte SMS-Logo-Übertragungsprogramme interpretieren weiterhin OTB-Bilder für die direkte Übertragung.
Obwohl weit entfernt vom Mainstream, hat OTB einen kleinen, aber leidenschaftlichen Platz in der Geschichte der mobilen Technologie.
Warum sehen OTB-Bilder so einfach oder von niedriger Qualität aus?
OTB wurde für monochrome Bildschirme mit Auflösungen von bis zu 84×48 Pixeln entwickelt.
Das Format verwendet 1-Bit-Farbe, was bedeutet, dass jeder Pixel entweder vollständig ein oder vollständig aus ist.
Mobiltelefone zu dieser Zeit hatten nicht die CPU-Leistung für Graustufen, Antialiasing oder sogar grundlegendes Dithering.
Wie schneidet OTB im Vergleich zu modernen Formaten wie PNG oder SVG ab?
OTB unterstützt keine Farben, keine Transparenzebenen, keine Kompression und keine Metadaten—Merkmale, die in PNG und SVG Standard sind.
OTB kann nicht skaliert werden, ohne dass es zu schwerer Pixelation kommt, da es streng ein Bitmap mit fester Auflösung ist.
Sein einziger Vorteil ist die Effizienz: OTB-Dateien sind extrem klein und schnell auf alter Hardware zu dekodieren.
Unterstützt OTB Farbe, Transparenz oder Graustufen?
Klassisches OTB ist streng monochrom—jeder Pixel ist schwarz oder weiß.
Transparenz wird nicht unterstützt; frühe Nokia-Displays hatten kein Konzept von Alphakanälen.
Graustufen- oder Farbvarianten wurden nie Teil der offiziellen OTB-Spezifikation.
Warum können viele Bildbearbeitungsprogramme OTB-Dateien nicht öffnen?
OTB ist ein Nischenformat, das fast ausschließlich auf frühen Nokia-Handys verwendet wird.
Viele Editoren enthalten keine Parser für 1-Bit-Mobile-Bitmap-Kodierungen.
Variationen zwischen verschiedenen Nokia-Modellen führten zu kleinen Unterschieden in der Dateistruktur.
Warum scheitern OTB-Konvertierungen manchmal oder verzerren?
Konvertierungsprobleme ergeben sich typischerweise aus strengen Einschränkungen im ursprünglichen Dateiformat:
Falsche Abmessungen
Einige Konverter interpretieren Breiten-/Höhenwerte falsch und erzeugen falsch skalierte oder zugeschnittene Bilder.
Bit-Packing-Probleme
Fehler bei der Interpretation von 1-Bit-Pixelströmen können zu beschädigten oder verschobenen Bildern führen.
Unerwartete Header-Varianten
Verschiedene Nokia-Modelle verwendeten leicht unterschiedliche OTB-Headerfelder.
Keine Graustufenverarbeitung
Graustufen-Eingabebilder müssen binarisiert werden, was oft zu harten, blockartigen Ergebnissen führt.
Abgeschnittene Dateien
Beschädigte SMS-Übertragungen oder Firmware-Dumps enthalten häufig unvollständige OTB-Ressourcen.
Spezielle Nokia-Logo-Konvertierungstools verarbeiten OTB in der Regel viel zuverlässiger als generische Konverter.
Unterstützt OTB eingebettete Metadaten?
Nein—OTB enthält keine Metadaten jeglicher Art.
Es unterstützt keine Orientierung, DPI, Zeitstempel, Farbprofile oder Autoreninformationen.
Alle Bedeutung und Kontext müssen von außerhalb der Datei kommen.
Wofür kann OTB heute noch verwendet werden?
Obwohl veraltet, hat OTB immer noch reale Nischenanwendungen:
Nokia Feature Phone Modding
Benutzer, die alte Geräte anpassen, verwenden weiterhin OTB-basierte Logos und Startbilder.
Mobile Geschichtsrecherche
Forscher, die die Benutzererfahrung früherer Telefone untersuchen, betrachten OTB-Ressourcen als Teil der UI-Entwicklung.
Retro-Nachrichten-Demonstrationen
OTB wird verwendet, um zu demonstrieren, wie alte SMS-basierte Bildübertragungen funktionierten.
Testen von eingebetteten Mikrodiplays
OTBs einfaches 1-Bit-Layout ist ideal zum Testen winziger LCD-Panels oder OLED-Steuerlogik.
Unix Conversion Tools
Certain ImageMagick builds still support OTB for historical completeness.
Niedrigstromsysteme
Da OTB so leichtgewichtig ist, bleibt es in ultrakleinen eingebetteten Projekten nützlich.
Betreiberlogo-Archive
Telekommunikationsnostalgie-Archive speichern häufig alte Betreiberlogos im OTB-Format.
Protokoll-Emulation
SMS-über-IP-Emulatoren unterstützen OTB für Authentizität bei der Übertragung retro Nachrichten.
Telekommunikationsforschung
Einige Telekommunikationsforscher analysieren OTB, da es die frühe Inhaltskodierung für drahtlose Netzwerke widerspiegelt.
Retro Digitale Kunst
Künstler nutzen manchmal die OTB-Einschränkungen, um pixelgenaue monochrome Designs zu erstellen.
Warum sind OTB-Dateien so klein?
Sie verwenden eine strenge 1-Bit-pro-Pixel-Codierung mit dicht gepackten Bits.
Die Bildabmessungen sind extrem klein und passen auf frühe Telefonbildschirme.
Keine Kompressionsschichten oder Metadatenblöcke erhöhen die Größe.
Wie groß kann ein OTB-Bild werden?
Die meisten OTB-Bilder bleiben aufgrund der Abmessungsgrenzen unter einigen hundert Bytes.
Nokia-Firmware wies häufig Bilder zurück, die die gerätespezifischen Pixelabmessungen überschritten.
Dateien, die größer als erwartet sind, weisen häufig auf beschädigte Daten oder nicht standardisierte Varianten hin.
Kann eine OTB-Datei mehrere Frames oder Animationen enthalten?
Nein—OTB unterstützt nur ein einzelnes statisches Bitmap.
Frühe Telefone verarbeiteten Animationen mit mehreren aufeinanderfolgenden OTB-Dateien.
Die Unterstützung für mehrere Frames wurde von der Firmware und nicht vom OTB-Format verwaltet.
Warum erscheinen einige OTB-Bilder gespiegelt oder umgedreht?
Einige alte Werkzeuge speicherten bit-packed Zeilen in umgekehrter Bit-Reihenfolge.
Unterschiede in der horizontalen Byte-Ausrichtung könnten das Bild unerwartet verschieben.
Einige Firmware-Varianten erwarteten vertikal invertierte Zeilen, was in modernen Konvertern zu Verwirrung führte.
Ist das OTB-Format heute noch relevant?
Für moderne Smartphones ist OTB obsolet, aber seine historische Bedeutung in der frühen mobilen Personalisierung bleibt erheblich.
Sein Minimalismus macht es nützlich in Mikrocontroller-Displays und als Lehrbeispiel für die Kodierung von 1-Bit-Grafiken.
OTB lebt weiterhin im Retro-Mobil-Modding, in der Emulatorentwicklung und in digitalen Archiven der frühen Textkultur.