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comp.lang.ruby

compare bitmaps

Junkone

9/11/2006 12:05:00 PM

hi
i am looking for libraries to compare bitmap images in png format. can
it be done in ruby?
seede
3 Answers

Kev Jackson

9/11/2006 12:09:00 PM

0

try RMagick the ruby interface to the ImageMagik libs

On 9/11/06, Junkone <junkone1@gmail.com> wrote:
> hi
> i am looking for libraries to compare bitmap images in png format. can
> it be done in ruby?
> seede
>
>
>

Alex Young

9/11/2006 12:09:00 PM

0

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

Farrel Lifson

9/11/2006 12:16:00 PM

0

On 11/09/06, Junkone <junkone1@gmail.com> wrote:
> hi
> i am looking for libraries to compare bitmap images in png format. can
> it be done in ruby?
> seede
>
>
>

It's probably easiest to generate MD5 hashes for each file and compare those.

Farrel