From: Alex Young <alex@...>
Date: 2006-09-11T21:09:21+09:00
Subject: Re: compare bitmaps

Junkone wrote:
> hi
> i am looking for libraries to compare bitmap images in png format. can
> it be done in ruby?
> seede
> 
> 
Yes.  You want to look at the RMagick library - specifically, if you're 
trying to do a pixel-wise difference, you'll want to look at the 
Image#composite method, and the DifferenceCompositeOp CompositeOperator.

-- 
Alex