免费转换 PPM 文件

联合图像专家组 - 使用有损压缩的照片最通用的图像格式。减少90-95%的文件大小，同时几乎没有可见的质量损失。没有透明度支持。非常适合照片、网页图像、电子邮件附件以及任何需要小文件大小的场景。可调的质量级别从1到100。自1992年以来的标准，具有通用设备和软件支持。理想用于照片和颜色丰富的复杂图像。

可移植网络图形 - 支持透明度和1600万种颜色的无损图像格式。文件比JPEG大，但完美保留质量。支持平滑透明度的alpha通道。非常适合徽标、带文本的图形、屏幕截图和需要透明度的图像。对于照片来说，比GIF压缩效果更好。非常适合网页图形、用户界面元素和任何需要无损质量或透明度的图像。自1996年以来的网页图形标准格式。

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.

图形交换格式 - 支持动画和透明度的图像格式，具有256色限制。简单图像的小文件大小。非常适合简单动画、表情符号、迷因和颜色较少的图形。对于有限调色板是无损的。对于照片（使用JPEG）或高色彩图形（使用PNG）效率低下。自1987年以来的通用支持。简单网页动画和反应图像的标准格式。

可缩放矢量图形 - 基于XML的矢量格式，能够在任何大小下完美渲染。无限缩放而不会失去质量或出现像素化。几何形状和插图的小文件大小。可用文本编辑器和设计软件编辑。非常适合徽标、图标、图表和需要缩放的图形。支持动画和交互性。响应式网页图形和分辨率独立设计的标准。现代网页图标的必备格式。

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图像文件格式 - 基于AV1视频编码器的下一代图像格式，提供比WebP和JPEG更好的压缩。以相同质量减少20-50%的文件大小。支持HDR、广色域和透明度。尖端压缩技术。浏览器支持不断增长（85%以上且持续增加）。非常适合未来的网页图像和最大效率。比任何以前的格式在更小的尺寸下提供更好的质量。推荐用于优先考虑性能的现代网站。

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.

标记图像文件格式 - 灵活的格式，支持多个页面、图层和各种压缩方法。专业摄影、出版和档案的行业标准。支持无损压缩、16位色深和广泛的元数据。文件大小较大，但质量极佳。非常适合印刷出版、照片档案、专业摄影以及需要最大质量和灵活性的场景。用于医学成像和专业扫描。

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.

高动态范围图像 - 存储亮度和色彩信息的格式，其范围大于标准图像。捕捉和显示JPEG/PNG中不可能的亮度级别。使用32位浮点编码。非常适合3D渲染、环境贴图和HDR摄影中的真实照明。游戏开发和建筑可视化中常见。实现真实的色调映射和曝光调整。专业照明工作流程的必备格式。

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 - 使用小波压缩的高级图像格式，在相同文件大小下提供比JPEG更好的质量。支持无损和有损压缩、渐进解码和ROI编码。用于医学成像、数字电影和档案。比JPEG具有更好的压缩伪影。编码/解码速度较慢。非常适合医学成像、数字保存和需要优越压缩的应用。网络浏览器支持有限。

JPEG立体 - 立体3D图像格式，存储左右眼视图并排或上下。基于标准JPEG，具有用于3D观看的特殊排列。用于3D摄影、虚拟现实内容和立体显示。与3D电视和虚拟现实头盔兼容。非常适合3D摄影、立体内容创作和虚拟现实/增强现实应用。需要特殊的观看设备以获得适当的3D效果。

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.

灵活图像传输系统 - 主要用于天文学的科学图像格式。存储带有广泛元数据头的天文图像。支持多个数据数组和表。天文数据档案的标准格式。非常适合天文成像、科学数据交换和研究应用。被全球主要天文台和航天机构使用。天文学研究和数据共享的必备格式。

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.

联合图像专家组 - 标准JPEG变体，扩展名为.jpeg，而不是.jpg。与JPG文件具有相同的格式和功能。相同的有损压缩和通用兼容性。与.jpg扩展名可以互换使用。非常适合所有适合JPG的场景。与JPG格式没有技术差异。扩展名的偏好因平台和传统而异。

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文件交换格式 - JPEG变体，具有特定的数据交换结构。最大兼容性编码JPEG的标准方式。包括特定的头标记和色彩空间定义。确保跨平台一致的JPEG解释。非常适合可靠的JPEG交换和档案。大多数JPEG实际上使用JFIF结构。确保JPEG互操作性的技术规范。

JPEG文件交换 - JFIF兼容JPEG文件的替代扩展。与标准JPEG/JFIF具有相同的格式和功能。偶尔被特定软件和系统使用。与所有JPEG查看器完美兼容。非常适合任何JPEG应用。考虑使用.jpg以获得更好的识别。功能上与标准JPEG格式完全相同。

JPEG交换格式 - JPEG图像的另一种扩展变体。与标准JPEG的压缩和结构相同。与JPEG软件完全兼容。与.jpg扩展名相比，使用较少。非常适合标准JPEG用例。重命名为.jpg以获得通用识别。与常规JPEG文件没有技术区别。

原始RGB - 未压缩的原始红绿蓝颜色数据，没有头或元数据。纯像素数据，需要宽度/高度规格以供查看。最大质量，文件大小巨大。用于图像处理管道和专业工作流程。非常适合图像处理中间件、科学成像和最大质量要求。需要外部尺寸信息。专业图像处理工作流程的必备格式。

原始RGBA - 未压缩的RGB数据，带有透明度的alpha通道。四个通道（红、绿、蓝、透明）没有压缩。需要尺寸规格以供正确查看。由于没有压缩，文件大小巨大。非常适合带透明度的图像处理、合成工作流程和专业图形。用于视频制作和游戏开发。最大质量保留带有alpha信息。

带不透明度的RGB - 包含不透明度/透明度信息的RGB格式变体。未压缩的像素数据，带有alpha通道。用于特定图形工作流程和专业软件。需要外部尺寸数据。非常适合专业合成、图形制作和透明度工作流程。在某些应用中是RGBA的替代品。保持最大质量和透明度。

原始图形格式 - 用于特定专业工作流程的未压缩原始图像数据。简单的二进制格式，没有元数据头。需要尺寸和色彩空间信息以供正确查看。用于专业成像应用和科学软件。非常适合图像处理管道、科学成像和专业图形工作流程。最大质量，文件结构最小。

YUV色彩空间 - 原始格式，分别存储亮度（Y）和色度（U，V）。广泛用于视频处理和广播。比RGB对人眼更高效。常见于视频编码器和专业视频设备。非常适合视频帧提取、广播工作流程和视频处理。电视和视频制作中的必备格式。实现视频编码器中的高效压缩。

UYVY色彩格式 - 打包的YUV格式，具有特定的字节顺序（U，Y，V，Y）。常见于视频捕获和专业视频设备。交错的色度和亮度以实现高效处理。被视频捕获卡和摄像机使用。非常适合视频帧处理、捕获工作流程和广播应用。专业视频设备中的标准格式。针对硬件视频处理进行了优化。

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 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.

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.

VIPS图像 - libvips图像处理库的格式。支持大图像和流式操作。针对大图像的高效内存使用进行了优化。用于图像处理管道和服务器端成像。非常适合处理大图像、批量操作和内存高效工作流程。服务器端图像处理的必备格式。libvips生态系统的专用格式。

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.

多图像网络图形 - 与PNG相关的动画图像格式。支持动画，压缩效果优于GIF。基于PNG的动画格式，具有先进功能。与GIF相比，浏览器支持有限。非常适合带透明度的复杂动画。比动画GIF质量更好。大多数用途已被APNG和WebP取代。

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.

无线位图 - 早期手机和无线设备的单色格式。针对有限的带宽和内存进行了优化。用于WAP（无线应用协议）时代。1位图像的小文件大小。非常适合旧版移动设备兼容性。早期移动网络的历史格式。与现代智能手机不兼容。

JPEG 2000参考 - JPEG 2000开发和测试的格式。用于单个图像组件的简单格式。用于JPEG 2000编码器的开发和测试。非常适合JPEG 2000研究、编码器测试和格式开发。图像压缩研究的专用格式。用于学术和标准工作。

调色板文件 - 各种图形软件使用的颜色调色板/色彩映射格式。存储索引图像的颜色查找表。与索引颜色图像和精灵图形一起使用。非常适合游戏开发、像素艺术工作流程和索引颜色管理。常见于复古游戏开发。调色板基础图形的必备格式。

色彩映射 - 另一种存储颜色查找表的调色板格式。被各种图形应用程序用于索引颜色。定义索引图像的可用颜色。非常适合索引颜色工作流程、游戏开发和调色板管理。常见于图形软件和游戏开发工具。与基于调色板的图像格式一起使用。

传真图像 - 传真机文档的格式。针对文本文档优化的单色格式。对黑白页面使用高效压缩。传真传输和存储的标准格式。非常适合传真文档档案、旧版传真系统兼容性和文档扫描。用于电信和文档管理。传真机兼容性的必备格式。

CCITT第3组传真 - 标准传真压缩格式（单维）。对黑白文档进行高效压缩。全球传真传输的标准。单维压缩算法。非常适合传真文档、扫描文本页面和电信。几乎所有传真机都使用。传真通信的基本标准。

CCITT第4组传真 - 高级传真压缩格式（二维）。对文本文档的压缩效果优于G3。更高质量的传真传输。二维压缩以实现更高的效率。非常适合高质量传真、文档档案和扫描工作流程。推荐用于质量和文件大小的传真格式。现代传真系统的标准。

JBIG - 用于高分辨率黑白图像的双级图像压缩标准。优于G3/G4传真格式的压缩效果。用于文档扫描和档案。渐进编码实现分辨率缩放。非常适合高分辨率文档扫描、档案成像和高效黑白压缩。G3/G4的继任者。用于专业文档管理。

JBIG图像 - JBIG压缩图像的替代扩展。与.jbg格式具有相同的能力。用于文档的高效双级压缩。用于文档成像和扫描应用。非常适合高质量文档压缩、扫描工作流程和档案系统。与.jbg文件的替代扩展。专业文档成像格式。

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.

慢扫描电视 - 业余无线电慢扫描电视的格式。通过无线电频率传输图像。用于业余无线电的图像传输。优化用于无线电传输的简单格式。非常适合业余无线电SSTV应用和无线电图像交换。无线电爱好者的专用格式。业余无线电通信中的重要格式。

IPLab图像 - IPLab图像分析软件的格式。用于科学图像处理和分析。支持各种数据类型和元数据。常见于显微镜和科学成像。非常适合IPLab软件兼容性、科学图像分析和显微镜工作流程。图像分析软件的专用格式。用于科学研究。

个人图标 - 用于电子邮件和新闻组的小图标格式。48x48像素的图像，代表目录中的人。用于学术和早期互联网系统。非常适合个人图标数据库和复古互联网系统。早期互联网时代的历史格式。学术系统的遗留格式。

在空中位图 - 用于诺基亚手机和无线设备的格式。用于手机应用程序和服务。针对有限设备的简单位图格式。非常适合诺基亚设备兼容性和复古移动应用。早期手机的遗留格式。智能手机之前的历史格式。