Animated gif preloaders generator

How ca开发者_如何学JAVAn I to create animated colorized gifs from templates in PHP? For example, when I go to preloaders.net, I choose some template and then can change it foreground color. How can I to correctly change colors in gif?

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Is it really necessary for to have GIF preloader graphics? If not, you could try a more contemporary approach. Also, much more configurable:

• Loading spinner animation using CSS and WebKit (37 Signals)
• spin.js "An animated CSS activity indicator" ← very slick

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Why not use CanvasLoader?

http://heartcode.robertpataki.com/canvasloader/

No need to worry about GIFs, it's using the HTML5 Canvas element