Convert RGB to HSL and HSL to RGB as live filter

[NotMyFault]

Hi,

 

after quite a bit of experimenting i finally found a working live filter to convert RGB into HSL, and back to RGB.

The HSL values are stored in RGB channels, and must be interpreted accordingly (e.g. multiply R by 360 to get the classical 0-360 degree for hue). H in R, S in G, L in B.

This will allow you to access individual channels (hue, saturation, and luminosity), and modify independently, or use for intelligent masking / filtering.

The formulas are based on: https://en.wikipedia.org/wiki/HSL_and_HSV#From_RGB

Please use RGB/16 to avoid rounding / banding issues, even if the formula are only capable to convert RGB/8 color data.

Use it at own risk, and have fun with it.

Purposes:

• Create mask or selections based on
• hue
• saturation 
• luminosity 
• upper / lower bounds of these values
• and combination of above (and, or)

 

• create 2 dimensional charts of one fixed and two variable parameters of the three, e.g. all possible  hue / saturation values for fixed luminosity of 50%

 

• modify saturation (independent from hue / lum)
• modify luminosity (independent from hue / sat)
• modify hue (independent from sat / lum)
• swap HSL channels 
• invert HSL channels

Update:

New Version, now working with V2

preset file for easy import into PT filter presets 

 

RGB HSL PT filter.aftoolpresets perfect RGB HSL RGB conversion with test image V2.afphoto

Edited February 2, 2023 by NotMyFault
New Version

[NotMyFault]

I checked the PT filter, it does not work in V2 under MacOS, as some of the variable names are now reserved. Will provide an update soon.

[MxHeppa]

Not yet updated?

 

[NotMyFault]

Updated. Template now works with V2.