iPhone 遮蔽颜色：删除背景颜色
我有一系列的头像；每个都有 RGB:255,0,255 的亮粉色背景。
而不是遍历每个头像，并手动去除粉红色背景；有没有办法让 Objective C 为我删除背景（掩盖它）？
头像示例如下：
替代文本 http://img39.imageshack.us/img39 /2645/bluegem.png
我担心的一件事是屏蔽是动态完成的，并且可能会消耗内存；这是我应该关心的事情吗？
另外，假设我将头像放在精灵表中；我可以敷一次面膜然后使用吗？
感谢您的帮助。
I have a series of avatars; each has a hot pink background of RGB:255,0,255.
Rather than going through every avatar, and manually removing the pink background; is there a way to make Objective C remove the background (masking it) for me?
An example of an avatar follows:
alt text http://img39.imageshack.us/img39/2645/bluegem.png
One thing I am concerned about is that the masking is done on the fly, and may cost memory; is this something I should be concerned about?
Additionally, let's say I put the avatars in a spritesheet; could I apply the mask once and work with that?
Thanks for your help.
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请参阅函数 CGImageCreateWithMaskingColors。我想这就是你所需要的。参见参考：
用颜色遮罩图像
see function CGImageCreateWithMaskingColors. I think this is what you need. See reference:
Masking an Image With Color
如果您以编程方式添加按钮，则可以在每次创建头像按钮时设置全局 NSArray 和 addObject:yourButton ，然后当您想要删除背景时，请执行以下操作：
If you added the buttons programatically you could set a global NSArray and
addObject:yourButtoneach time you make an avatar button, then when you want to remove the background do this: