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Re: TortoiseIDiff "compare" vs. "show difference"

From: Stefan Küng <tortoisesvn_at_gmail.com>
Date: 2007-07-19 15:10:24 CEST

On 7/19/07, Simon Large <simon.tortoisesvn@googlemail.com> wrote:
> On 19/07/07, Stefan Küng <tortoisesvn@gmail.com> wrote:
> > On 7/19/07, Lorenz <lorenznl@yahoo.com> wrote:
> >
> > > The layout editor (circuit diagrams and board layouts) we are using
> > > (cadsofts EAGLE) has no diff tool of its own, so I'm exporting to bmps
> > > and comparing them.
> >
> > I know that one very well :)
> >
> > > For that purpose it would be nice if TortoiseIDiff could not only show
> > > an overlay of both bmps, but also a difference bmp (numerical,
> > > per-pixel difference).
> > > One then could locate differing section easyly, zoom-in and switch
> > > back to the overlay mode to examine in-detail.
> > >
> > > Any change such thing could be implemented?
> >
> > I'm sorry, but I don't understand what you mean with "difference bmp".
> > Do you maybe mean instead of alpha-blending the two images over one
> > another use maybe XOR (or some other combining algorithm) to 'merge'
> > the images together?
>
> Blending = (pixelA + pixelB) / 2;
>
> Difference = func(pixelA - pixelB);
>
> or something like that, so you get plain areas where the content is
> identical, and hotspots where there are differences. Maybe this can be
> done by making one of the images negative and using 50% alpha blend?
>
> That sounds like a useful feature for quickly finding what has changed
> in a graphic file.

you mean this?
http://issues.tortoisesvn.net/index.php?do=details&task_id=300

Stefan

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Received on Thu Jul 19 15:09:35 2007

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