LiveCode Forums.

Hi All,

Download this GUI Stack for Scott Raney's Color Conversion Functions:
RGB to HSV and HSV to RGB.

Only for certain colors this is a lossy conversion: Once you convert some
RGB colors to HSV, the function HSVtoRGB does not restore them back
exactly as before.
Does anyone knows (or have created) a pair of RGBtoHSV and HSVtoRGB
color conversion functions that do not lose or change color information?

Thanks in advance!

Al

Alejandro,

the problem is here the integer rounding.

An integer RGB triple converts correctly to HSV/HSL expressed as floats.
You can then go back 'exactly' (if the floats are exact enough) to RGB.

But obviously you can't go back from the HSV/HSL floats _changed to integer_ to the same RGB. The error will usually be within plus/minus 1 of 255.

H.

I understand. Then, I just need to change a single number in this script:

Change the script of button "HSV to RGB" from this:
if the number of lines of fld 2 = 2 then
put line 2 of fld 2 into w

To this:
if the number of lines of fld 2 = 2 then
put line 1 of fld 2 into w

Many thanks for pointing this!

Al