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Number 7
Number 7
Participating Frequently
February 4, 2021
Question

is there a way that precisely change color with Hue/Saturation tool ?

  • February 4, 2021
  • 2 replies
  • 739 views

This is the example that change RGB(232,160,51) to RGB(11,158,11) with "Hue/Saturation" tool.

I think there is a way,but the result is not correct. Here is what i thought:

1. Change both RGB color to HSL color.

2. The target color value minus orginal color value of HSL

3. Then I adjust the difference with Hue/Saturation tool.

I think my idea would be possible. but i have 2 problems

1. I don't know the RGB value's HSL value, so I directly use below link's HSL value: RGB(232,160,51) equal to HSL (36,80,55). RGB(11,158,11) equal to HSL(120,87,33)

http://www.workwithcolor.com/color-converter-01.htm

HSL(120,87,33)-HSL (36,80,55)=difference (84,7,-22)

2. The Hue/Saturation tool is not equal to HSL value that i find on web. the Hue vuale is -180 to 180 (total 360=360°), the Saturation value and Lightness value is -100 to 100(total 200). So i make the 200 value to percentage. so HSL(120,87,33)-HSL (36,80,55)=HSL difference (84,7,-22)=Hue/Saturation difference(84,14,-44), I adjust Hue/Saturation difference(84,14,-44), like below picture, but I didn't get what i want. the result color is RGB(21,138,21), It's not the RGB(11,158,11). I guess maybe this web's arithmetic is different to "Hue/Saturation"

 

is there a way that precisely change color with Hue/Saturation tool ?

    This topic has been closed for replies.

    2 replies

    Chuck Uebele
    Community Expert
    Chuck UebeleCommunity Expert
    Community Expert
    April 4, 2022

    As NB, colourmanagement net

    mentioned, RGB is device dependent, so you will have difficult time getting consistency. Not to mention Hue/Sat is a real clunky way to precisely change color. I would use L*A*B* and curves to change an object's color. I would also check out Dan Margulis' examples of using L*A*B* to change color. 

      C
      ChrisLeicester
      Known Participant
      April 4, 2022

      Thank you for the responses - I wasn't trying to do anything particularly clever, though. I had a very simple image - a simple outline map of Europe, in fact - where the countries were in a uniform brown and the sea in a uniform grey. I simply wanted to change the brown to yellow, and the grey to blue. I'd assumed changing one colour to another would be trivial - I wasn't playing around with a photo, just a very simple graphic. Changing hue/sat seemed to be the only choice offered by Photoshop, using Image | Adjustments | Change Color...  I would much rather NOT play around with Hue/Sat, but just have RGB values to enter instead, which (for me) would have been a lot easier. I seem to recall that it was easy when I did it once in GIMP, and assumed that Photoshop would have the same functionality.

      C
      ChrisLeicester
      Known Participant
      April 4, 2022

      This is exactly my issue too. The Adobe advice is to fiddle with the sliders until "you're satisfied". That's really NOT very satisfactory - surely a product as expensive as Photoshop should allow me to select a precise colour using either RGB or HSL?

      NB, colourmanagement
      Community Expert
      NB, colourmanagementCommunity Expert
      Community Expert
      April 4, 2022

      I guess you can set a permanent eyedropper on the area you'd like to have a specific value - set it to the 'value' scale you need [e.g. RGB] and edit away.

      In the spirit of completeness, I should add that, of course, one must be aware that seeking a specific target value is image colour space dependent. 

      This means that using the same target value in sRGB or AdobeRGB (1998) will produce different colours.

       

      I hope this helps
      neil barstow, colourmanagement net :: adobe forum volunteer:: co-author: 'getting colour right'
      google me "neil barstow colourmanagement" for lots of free articles on colour management

       

       

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