获取iOS中CGImageRef的平均RGB颜色 [英] Getting the average RGB color of a CGImageRef in iOS

问题描述

我已经为此苦苦挣扎了两个小时，我希望其他人能对此有所了解。我正在寻找一种获取1x1 UIImage的平均RGB颜色的方法。到目前为止，我已经从UIImage创建了CGImageRef，但是我真的是CoreGraphics的新手，所以我不确定从那里去哪里。任何帮助表示赞赏。谢谢！

I've been struggling with this for a couple of hours, and I'm hoping someone else has some insight. I'm looking for a way to get the average RGB color of a 1x1 UIImage. So far I've created a CGImageRef from the UIImage, but I'm really new to CoreGraphics, so I'm not sure where to go from there. Any help is appreciated. Thanks!

推荐答案

如果您有CGImage，则可以通过调用

If you have a CGImage, you get the data by calling

CGDataProviderRef CGImageGetDataProvider (
   CGImageRef image
);

CGImage文档

然后您就可以复制数据

CFDataRef CGDataProviderCopyData(
   CGDataProviderRef provider
);

CGDataProvider文档

由于 CFData 与 NSData 相同，可以将其强制转换并检索字节

Since CFData is the same as NSData you can cast it and retrieve the bytes

- (const void *)bytes

CFData文档

NSData文档

现在您有了原始字节，可以使用它们进行任何操作，使用

Now you have the raw bytes, you can do anything with them, use

CGImageAlphaInfo CGImageGetAlphaInfo (
   CGImageRef image
);
CGBitmapInfo CGImageGetBitmapInfo (
   CGImageRef image
);

获取信息如何将图像数据存储在所获取的字节中。

to get information how is the image data stored in the bytes you got.

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