什么是PNG？
PNG（可移植网络图形）是一种无损图像格式，支持透明度，非常适合需要清晰边缘和像素完美质量的图形、徽标和网页图像。
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What is it?
PNG（可移植网络图形）是一种无损光栅图像格式，于1996年创建，作为专利GIF格式的开放替代品。与JPG不同，PNG在压缩过程中从不丢弃图像数据，完美保留每个像素的原始捕捉。
PNG支持完整的alpha通道透明度，这意味着像素可以完全透明、完全不透明或介于两者之间的任何级别。这使其成为徽标、图标、用户界面元素以及任何需要透明背景的图像的标准选择。
Technical Specifications
Pros & Cons
Advantages
Every pixel is preserved exactly - no quality loss on repeated saves.
Full alpha channel allows transparent and semi-transparent backgrounds.
Perfect for screenshots, UI elements, logos, and text-heavy graphics.
Supported by every browser, image editor, and operating system.
Disadvantages
Significantly larger than JPG for photographic content - not ideal for photos.
Static format only. Use APNG or GIF for animated images.
Limited metadata support compared to JPG or TIFF.
High-resolution PNG files can slow down web page loading.
When to Use It
当图像质量和透明度比文件大小更重要时，PNG表现出色。
Logos and Branding
Transparent backgrounds make PNG the go-to format for logos used on varied backgrounds.
Screenshots
Captures screen content with perfect sharpness - no compression artifacts.
UI and Icons
Interface elements, buttons, and icons require pixel precision that only lossless formats deliver.
Graphics with Text
Charts, infographics, and annotated images stay crisp and readable.
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Is PNG better than JPG?
It depends on the content. PNG is better for graphics, logos, and images with transparency. JPG is better for photographs where smaller file size matters more than pixel-perfect accuracy.
Why is my PNG file so large?
PNG uses lossless compression, so file sizes are larger than JPG. To reduce size without losing quality, use a PNG optimizer or convert to WebP for web use.
Does PNG support animation?
Standard PNG does not support animation. APNG (Animated PNG) is an extension that adds animation support, but it is not universally supported.
Can I convert PNG to JPG without losing quality?
Converting PNG to JPG always introduces some quality loss because JPG uses lossy compression. Any transparent areas will be filled with white. If quality is critical, keep the PNG.
What is the difference between PNG-8 and PNG-24?
PNG-8 supports 256 colors (like GIF) and produces smaller files. PNG-24 supports millions of colors with full alpha transparency. Use PNG-24 for most modern use cases.