[Gambas-user] Comparing 2 pictures

[richard terry]

On Mon, 10 Aug 2009 11:38:02 pm Rob wrote:
> On Monday 10 August 2009 08:42 am, Doriano Blengino wrote:
> > There is a program called GQView (and probably others) which have
> > algorithms to compare two images in the right way - ie scale them to
> > same size, compress colors and normalize them, then compare pixel by
> > pixel using a good tolerance.
> > I did something similar, it is  a pascal source (if I only remember
> > where I put it); or you can download those sources and look into them (C
> > sources, I suppose).
>
> I did the same thing in Perl about 9 years ago, circa Mandrake 7.  Don't
> know if it would even run with current versions of everything, and it's
> heavily dependent on Imagemagick for the normalizing, but here it is:
>
> http://www.kudla.org/raindog/perl/
>
> (see findimagedupes, the first entry on that page)  Also includes someone
> else's C++ implementation of the comparison function which sped it up by
> several orders of magnitude.
>
> But if both pictures are guaranteed to be the same size, something as
> simple as converting each one to text-based PPM format and using diff
> should be sufficient.
thanks, but whats a PPM format? (sorry I'm image illiterate)

Richard

>
> Rob
>
>
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