调整动画GIF文件大小而不破坏动画

如果你有imagemagick访问权限，你可以这样做：

if you have imagemagick access, you can do this:

system("convert big.gif -coalesce coalesce.gif");
system("convert -size 200x100 coalesce.gif -resize 200x10 small.gif");

如果您没有system（）访问权限，很可能使用imagemagick插件

this is most likely possible with the imagemagick plugin if you don't have system() access

注意：这可能会创建一个更大的文件大小，但由于合并基本上不优化图像，因此尺寸较小的图像。

NOTE: this may create a larger filesize though a smaller dimensions image due to coalescing essentially deoptimizing the image.

更新：
如果您没有ImageMagick访问权限，您应该能够使用以下步骤的组合来调整动画gif的大小（假设您有GD访问权限）：

UPDATE: If you don't have ImageMagick access, you should be able to use a combination of the following steps to resize an animated gif (assuming you have GD access):

1. 检测图像是否是动画gif：我可以使用php和gd检测GIF动画吗？（热门答案）


2. 将动画gif拆分为单独的帧： http：//www.phpclasses。 org / package / 3234-PHP-Split-GIF-animations-into-multiple-images.html


3. 调整各个帧的大小： http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/


4. 将帧重新组合成又一个GIF动画： http://www.phpclasses.org/package/3163-PHP-Generate-GIF-animations-from-a-set-of-GIF-images.html

1. Detect if the image is an animated gif: Can I detect animated gifs using php and gd? (top answer)
2. Split the animated gif into individual frames: http://www.phpclasses.org/package/3234-PHP-Split-GIF-animations-into-multiple-images.html
3. Resize the individual frames: http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/
4. Recomposite the frames into an animated gif again: http://www.phpclasses.org/package/3163-PHP-Generate-GIF-animations-from-a-set-of-GIF-images.html

这肯定比ImageMagick路线密集得多，但它在技术上应该是可行的。

This is definitely much more intensive than the ImageMagick route, but it should be technically possible.

如果你让它运作，请与世界分享！

If you get it working, please share with the world!