I think it would be fine to install pdiff on the server and have the build
run those specific tests when it is around. Just as long as it does not
become a dependency for setting up a local development I think it is fine.
Just let me know and I will install pdiff on the build server.
On Sun, Mar 27, 2011 at 1:02 PM, Simone Giannecchini <
[email protected]> wrote:
> Ciao Andrea,
> I would suggest going for perceptual diff, the problem you have
> identified (similarity in images)
> is an hard problem to solve per se and I am worried by the fact that
> we might be introducing
> too much complexity for performing this test, at least unless we find
> something java-based that we know it works reasonably already
> and requires zero coding.
>
>
> Regards,
> Simone Giannecchini
> -------------------------------------------------------
> Ing. Simone Giannecchini
> GeoSolutions S.A.S.
> Founder
>
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
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>
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> -------------------------------------------------------
>
>
>
> On Sun, Mar 27, 2011 at 10:38 AM, Michael Bedward
> <[email protected]> wrote:
> > Hi Andrea and Ian,
> >
> > I'm following this discussion with great interest. I've also fallen
> > prey to the difficulty of pixel by pixel comparison across different
> > platforms in the past.
> >
> > I'm afraid I don't have any independent suggestions but I'd certainly
> > support using a tool like PerceptualDiff regardless of it only being
> > possible for a subset of platforms / contexts. Meanwhile, I'll read
> > the docs and the JIP Cookbook page.
> >
> > Michael
> >
> >
> > On 27 March 2011 07:32, Andrea Aime <[email protected]>
> wrote:
> >> On Sat, Mar 26, 2011 at 9:18 PM, Andrea Aime
> >> <[email protected]> wrote:
> >>> I think a reasonable way forward could be to start using perceptual
> diff,
> >>> but encapsulate its usage in a java wrapper that could be evolved
> >>> in portable java code if anybody finds the time to do it.
> >>> But in the meantime we'd at least get some decent testing on machines
> >>> that do have perceptual diff available...
> >>
> >> Ah, found this one (again, looked at it in the past too):
> >>
> >> http://www.lac.inpe.br/JIPCookbook/6050-howto-compareimages.jsp
> >>
> >> Now... what that algorithm is doing is probably quite a bit over the
> board.
> >> If for example the only change is the zoom level I don't want the
> algorithm
> >> to tell me the images are similar enough...
> >> I just want the tool to tell me if a human would spot a difference...
> >>
> >> My concern is would be moving from the past tool that required the
> >> two images to be pixel by pixel identical, which failed, to one that
> would
> >> not spot obvious differences... which would also fail
> >>
> >> Cheers
> >> Andrea
> >>
> >> --
> >> -------------------------------------------------------
> >> Ing. Andrea Aime
> >> GeoSolutions S.A.S.
> >> Tech lead
> >>
> >> Via Poggio alle Viti 1187
> >> 55054 Massarosa (LU)
> >> Italy
> >>
> >> phone: +39 0584 962313
> >> fax: +39 0584 962313
> >> mob: +39 333 8128928
> >>
> >> http://www.geo-solutions.it
> >> http://geo-solutions.blogspot.com/
> >> http://www.youtube.com/user/GeoSolutionsIT
> >> http://www.linkedin.com/in/andreaaime
> >> http://twitter.com/geowolf
> >>
> >> -------------------------------------------------------
> >>
> >>
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OpenGeo - http://opengeo.org
Enterprise support for open source geospatial.
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