How to get pixel color at location from UIimage scaled within a UIimageView

Question

I\'m currently using this technique to get the color of a pixel in a UIimage. (on Ios)

- (UIColor*) getPixelColorAtLocation:(CGPoint)point {
UIColor* color =         


        

Answer 1

Here's a pointer:

0x3A28213A //sorry, I couldn't resist the joke

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For real now: after going through the comments on the page at markj.net, a certain James has suggested to make the following changes:

size_t w = CGImageGetWidth(inImage); //Written by Mark
size_t h = CGImageGetHeight(inImage); //Written by Mark
float xscale = w / self.frame.size.width;
float yscale = h / self.frame.size.height;
point.x = point.x * xscale;
point.y = point.y * yscale;

(thanks to http://www.markj.net/iphone-uiimage-pixel-color/comment-page-1/#comment-2159)

This didn't actually work for me... Not that I did much testing, and I'm not the world's greatest programmer (yet)...

My solution was to scale the UIImageView in such a way that each pixel of the image in it was the same size as a standard CGPoint on the screen, then I took my color like normal (using getPixelColorAtLocation:(CGPoint)point) , then I scaled the image back to the size I wanted.

Hope this helps!