如果你发现图片中只用到了4种颜色，而在调色板的中显示的256色的颜色槽，那么这张图片就还有压缩的空间。

When you see an image useing 4 colors and a 256 color "slots" in the palette, there is room for improvement.

youdao

最适合线型图片和计算机生成的图片。仅适用256色，对许多照片而言，颜色不足。

Best for line art and computer-generated drawings. Only 256 colors. Insufficient color for many photos.

youdao

填充色选项包括：1600万种颜色、透明度、渐变、纹理和图片填充。

This includes control over the fill: 16 million colours, transparency, gradient fills, and texture and picture fills.

youdao

填充色选项包括：1600万种颜色、透明度、渐变、纹理和图片填充。

This includes control over the fill: 16 million colours, transparency, gradient fills, and texture and picture fills.

youdao