Comments on: What Color is My Pixel? Image based color picker on iPhone

By: markj

markj — Wed, 14 Jul 2010 18:40:27 +0000

Hey Marina – thanks for posting this update :-), and nice job remembering to include the check for the new .scale property.

By: Marina

Marina — Wed, 14 Jul 2010 18:36:41 +0000

This code needs a minor adjustment to properly work with high resolution images on iPhone 4.
In function – (UIColor*) getPixelColorAtLocation:(CGPoint)point you need to add the following to lines:

CGFloat x = 1.0;
if ([self.image respondsToSelector:@selector(scale)]) x = self.image.scale;

and then change this line:
int offset = 4*((w*round(point.y))+round(point.x));
to this:
int offset = 4*((w*round(point.y))+round(point.x)*x);

Then everything works just fine on iPhone 4, and should still work fine if they come up with other resolution devices.

By: Mobin

Mobin — Thu, 01 Jul 2010 12:11:36 +0000

Really Awesome dude… It really helps me…

By: Mital Pritmani

Mital Pritmani — Tue, 29 Jun 2010 07:12:53 +0000

hello,

this was a great tutial. Thanks for code also.

It worked and was very helpful for me.

By: pinkroad » Blog Archive » pixel RGB value

pinkroad » Blog Archive » pixel RGB value — Sat, 06 Mar 2010 10:21:23 +0000

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