Hi,
I'd like to ask a question about the algorithm that filter uses.
The file that handles the simulation is cdisplay_colorblind.c.
I've tried to reimplement it in another language and in the function
cdisplay_colorblind_convert with certain colors (for instance #000000) I get a
warning of division by zero in the section that corresponds to this in the
original code:
switch (colorblind->deficiency)
{
case COLORBLIND_DEFICIENCY_DEUTERANOPIA:
tmp = blue / red;
^^^^^^^^^^
(that's line 435) and in the sections where it computes tmp for other types of
deficit:
case COLORBLIND_DEFICIENCY_PROTANOPIA:
tmp = blue / green;
and
case COLORBLIND_DEFICIENCY_TRITANOPIA:
tmp = green / red;
Perhaps those errors are ignored in C, but shouldn't they be handled correctly
or prevented ?
The most important problem is however that when I try to convert white
(#ffffff) with the filter,I get #dadada for all 3 deficit simulations.
#dadada is a shade of grey, but if I apply in gimp the filter to an area which
contains white regions, white remains white.
I don't understand deeply the gimp sourcecode,is any postprocessing applied
after the filter has returned the new color values ?
Thank you in advance,
Giacomo
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