Calculemus ([email protected]) wrote:
> I am reading this: docs.gimp.org/en/gimp-concepts-layer-modes.html
>
> and I wonder why is the formula for "Multiply", E = (M * I) / 255?
>
> Why divide with 255, that is the part that confuses me.
> Should it not be just M * I and then clamp the result in range 0 to 255?
for 8 bit modes 255 is equivalent to the value 1.0. So the proper
formula would be
E = (M/255 * I/255) * 255.
I guess you can see how the other formula happens then :-)
Bye,
Simon
--
[email protected] http://simon.budig.de/
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