UIImage灰度阈值

Question

I want to threshold a grayscale UIImage. What's the easiest way to do this?

I think I have to get the bitmap of the UIImage and then compare it to some value and then set it to either 0/255. How to get the bitmap?

Answer 1

If you are looking to get bitmap from UIImage here is a complete tutorial.

iOS: Converting UIImage to RGBA8 Bitmaps and Back

This will surely help you.

Thanks