Select-by-color range and .isSelected()

[Boudewijn Rempt]

I'm now at a point where I do have something nearly working in the colorrange
dialog (although I must admit that I'm stumped about the correct algorithm, 
can't seem to be able to think something up), but now I've found the next 
issue: 

Selection is not an on/off binary value, but a range. The isSelected() method 
returns a boolean to the filters, and that's the first place where we go 
wrong. It's not clear to me how we should handle a 50% selected pixel, 
either.

Desaturate is easy: just halve the saturation in the hsv representation of a 
pixel. But oilpaint? Sharpen? What would be the meaning of 69% selected 
there? Blit the sharpened pixel with 69% opacity over its original?

Finally, I cannot seem to be able to get the selection preview or the 
selection mask done with a nice grayscale effect, the effect remains bitmappy 
on/off whatever I do.

-- 
Boudewijn Rempt 
http://www.valdyas.org/fading/index.cgi
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