GIF（图形交换格式）
GIF 是一种位图图像格式，以支持简单动画而闻名。它使用无损 LZW 压缩，但每帧限制为 256 色调色板。GIF 在短动画片段、表情图和简单图形方面仍然很受欢迎。
MIME 类型
image/gif
类型
二进制
压缩
无损
优点
- + Native animation support without JavaScript
- + Universal browser support since the 1990s
- + Simple 1-bit transparency
缺点
- − Limited to 256 colors per frame
- − Large file sizes for animations compared to video
- − No alpha transparency (only on/off)
何时使用 .GIF
适用于简单动画、表情图和色彩有限的小型图形。对于照片，建议使用 JPEG 或 WebP。
技术细节
GIF 使用 LZW 压缩，每帧最多支持 256 色调色板。动画通过存储多帧画面实现，每帧可设置独立的延迟时间和处置方式。
历史
GIF 由 CompuServe 于 1987 年推出，是最早在网络上使用的图像格式之一。动画 GIF 变体（GIF89a）于 1989 年发布。
从 .GIF 转换
转换为 .GIF
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