问题描述
我需要在不破坏动画的情况下调整动画GIF文件的大小。
I need to resize an animated GIF file without destroying the animation.
如何使用PHP进行操作?
How can I do it using PHP?
推荐答案
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):
- 检测图像是否是动画gif:(热门答案)
- 将动画gif拆分为单独的帧:
- 调整各个帧的大小:
- 将帧重新组合成又一个GIF动画:
- Detect if the image is an animated gif: Can I detect animated gifs using php and gd? (top answer)
- Split the animated gif into individual frames: http://www.phpclasses.org/package/3234-PHP-Split-GIF-animations-into-multiple-images.html
- Resize the individual frames: http://www.akemapa.com/2008/07/10/php-gd-resize-transparent-image-png-gif/
- 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!
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