Comment 20 for bug 166622

The problem may come from the fact that the min/max values for HSL sliders (sorry I said HSV, inkscape uses the slightly different HSL color space), together with their mapping to real (H,S,L) values are simply _wrong_, and maybe the conversion RGB/HSL functions too.

HSL components are NOT addititive components on the same scale like RGB components are. Instead, HSL components are:
 H is a real number in degrees and should be in [0,360] (360 = 0)
 S is a real number in [0,1]
 L is a real number in [0,1] (Same thing for V in HSV color space BTW)

What applications (e.g gimp) use the following values in their color selection tool:
 H: integer in [0,360]
 S: integer in [0,100] (% Saturation)
 L: integer in [0,100] (% Lightness)

Inkscape uses [0,255] for all of them, which is valid ONLY if they map discrete values to real values as follows:
 H: [0,255] -> [0,360]
 S: [0,255] -> [0,1]
 L: [0,255] -> [0,1]

I suspect that inkscape has this all screwed up, as min/max values of [0,255] for HSL is _very_ uncommon and absolutely unintuitive.

I am not familiar with inkscape code. Could you check that the min/max values and conversion functions are correctly implemented in inkscape ?

Conversions functions are explained here:
http://en.wikipedia.org/wiki/HSL_color_space

Cheers.