How to get the pixels fit the specified color in bitmap UIImage?

Question

I want to find out all the pixels fit the specified color in bitmap.

For example, I want to find the positions(x, y) of the pixels these are color: [UIColor colorWithRed:255 green:0 blue:0 alpha:1].

How to get this?

score 0 · Answer 1 · edited May 23 '17 at 12:05

0

This should get you started:

edited May 23 '17 at 12:05

Community

answered Jun 28 '13 at 06:00

Danilo

`UIImagePNGRepresentation()` returns, as the name says, PNG data, which is a **compressed** representation of the image. Accessing the pixels like in your code will not work. – Martin R Jun 28 '13 at 06:02
Thank you, but I want to find the pixel position with color, not find color of the pixel from image. – Suge Jun 28 '13 at 07:01

1 Answers1