Am 30.11.2012 um 20:37 schrieb William Koperwhats <[email protected]>:
> So far performance hasn't been a real issue, but I'm more interested in how
> these two functions achieve their results.
CombineMBS with mode 8 does this:
if (x1>x2)
{
return x1-x2;
}
else
{
return x2-x1;
}
So we compare and return difference for each red, green and blue value.
DiffPicturesMBS on the other hand does make diff of picture and changes sign if
needed.
int r=(r1-r2);
int g=(g1-g2);
int b=(b1-b2);
\
if (r<0) r = -r;
if (g<0) g = -g;
if (b<0) b = -b;
Not sure which one is better.
> One thing that I've noticed is that if I subtract a grey area that is
> *brighter* than the underlying image, rather than leaving a black hole (which
> is what I would expect), it will actually cause a bright spot, like it was
> "wrapping around" the color space or something. Can you offer any insight on
> why this might be?
Well, actually I could add another mode to CombineMBS where you get black if
one image pixel value is higher than other.
Greetings
Christian
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