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

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.

Simon

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