Talk:Color presets

@Raffriff42,

I don't know what formula's you used to calculated the HSL values but they seem to be wrong. Wikipedia contains the formula's where 0<=H<360.0, 0<=S<=1 and 0<=L<=255. I suggest you use those. Example (color_blueviolet):

R = 138
G = 043
B = 226
M = max(R,G,B) = 226
m = min(R,G,B) = 43
C = M - m = 183
B = M => H = 60*(4+(R-G)/C) = 60*(4+(138-43)/183) = 271.15
L = (M+m)/2 = 134.5
S = C/(255-|2*L-255|) = 183/(255-|2*134.5-255|) = 0.76

Also you should add an appropriate reference for this. Admin 00:18, 19 August 2014 (CEST)

Sure thing, I created RGB BlankClips with the values from colors_rgb.avsi, converted to YV12 with matrix="PC.601", and calculated hue as

atan2(VPlaneMedian-128, UPlaneMedian-128)*180/PI + 360) % 360

My complete script is posted here: [1] Raffriff42 15:31, 19 August 2014 (CEST)

The values you posted have nothing to do with the color model HSL. The values you posted stand for hue, saturation and luma derived of the YCbCr colorspace. I suggest you name it (HSL)_ycbcr or something like that. Since the colorpresets are given in rgb values it would make more sense to include (HSL)_rgb instead. Admin 16:04, 19 August 2014 (CEST)