How to code accurate Color Balance values within copresets ?

Chris

• May 10, 2020 15:56

See question in the title.

I would like to make use of the correspondence for the color values set in the Color Balance tool with the color values stored within the .copreset files.

For example, my goal is to create a range of 3 related Color Balance copresets files.

- copreset file 1:

• yellow hue, saturation and lightness in highlights
• pink hue in shadows, with 20% saturation 50% lightness

- copreset file 2:

• same yellow in highlights
• same pink in shadows but with 40% saturation

- copreset file 3:

• same yellow in highlights
• same pink in shadows but with 60% saturation

Therefore I would like to create 1 copreset file for option 1 and then manually edit 2 copies of the xml coprest file with accurate HSL values.

Here is the sample xml code line for the below "pink" shadow adjustments

<E K="ColorBalanceShadow" V="1;0.936347246170044;0.979828298091888" />

Just, what do these numbers mean? 1 ; 0.936... ; 0.979...

1

• 

  yeoul shin

  • November 23, 2020 09:14
  • Edited

  maybe.. I think these numbers are RGB coordinates of color value.

  choose your color @ HSB mode

  HUE : 0 ~ 360

  SATURATION : 0 ~ 30

  BRIGHTNESS : ? (I've only tested at master color balance so I set this value to 100)

  change its color value to rgb then convert 0 ~ 255 value to 0.0 ~ 1.0 scale.

  I used linear interpolation expression.

  0.0 to 1.0 value = (VALUE-0)/(255-0)*(1-0)+0

   

  ex) pink, 40%

  hue = 320, sat = 12 (30 * 40%), brightness = 100

  so I can get rgb value of 255, 224, 245

  then convert to 0.0 ~ 1.0 scale.. and I got some numbers

  1;0.878431373;0.960784314

   

  it's not a clear answer but hope this helps you well!

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• 

  Chris

  • November 23, 2020 22:45
  • Edited

  Interesting ! I will definitely give it a try.
  I’m curious about how you came up with the 0~30 range for Saturation. It’s definitely not as obvious as 0 to 360 or 0 to 100...

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• 

  yeoul shin

  • November 24, 2020 05:13
  • Edited

  I checked the values of various colors with many or less saturation. 
  then I have found that the maximum and minimum values of the color do not exceed that satruration range of 0 to 30.

  annnd.. It's just my guess. X) Cheer up to discover more!!

   

  this is simple excel sheet of value convertor i wrote.

  https://www.dropbox.com/s/4gmu8gdjgcdr862/convert.xlsx?dl=0

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