Iphone屏蔽颜色:删除背景颜色

I have a series of avatars; each has a hot pink background of RGB:255,0,255.

我有一系列的化身;每个都有RGB的亮粉色背景: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?

而不是遍历每一个头像，手动删除粉色背景;有没有办法让Objective - C去掉背景(蒙版)?

An example of an avatar follows:

一个化身的例子如下:

alt text http://img39.imageshack.us/img39/2645/bluegem.png

alt文本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?

我担心的一件事是掩蔽是在动态进行的，可能会消耗内存;这是我应该关心的吗?

Additionally, let's say I put the avatars in a spritesheet; could I apply the mask once and work with that?

另外，假设我把化身放在spritesheet中;我可以使用一次蒙版吗?

Thanks for your help.

谢谢你的帮助。

2 个解决方案

#1

see function CGImageCreateWithMaskingColors. I think this is what you need. See reference: Masking an Image With Color

看到CGImageCreateWithMaskingColors函数。我想这就是你需要的。见参考:用颜色遮蔽图像

#2

If you added the buttons programatically you could set a global NSArray and addObject:yourButton each time you make an avatar button, then when you want to remove the background do this:

如果你按程序添加按钮，你可以设置全局的NSArray和addObject:yourButton每当你创建一个头像按钮，那么当你想要删除背景时，你可以这样做:

for (UIButton *custom in globalButtonArray) {
    custom.backgroundColor = [UIColor clearColor];
}

#1