Follow-up Comment #1, bug #16185 (project mypaint):

The reason for this behaviour is the conversion between HSV and RGB.
If "value" or "saturation" are zero, the conversion to RGB will result in
0,0,0 for r,g,b.

gcolor2 for example is able to update its UI when changing hue, even if value
is 0 or 1. I'm not sure how this is done, but I guess it simply relies on HSV
and updates the UI manually (--> I think there is no set_color_hsv method for
pygtk.gdk.ColorSelection).

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  <http://gna.org/bugs/?16185>

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