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I
Ishigami
Participating Frequently
April 2, 2025
Answered

Uneven Brightness

  • April 2, 2025
  • 1 reply
  • 750 views

Hello everyone,
I am having a problem when running an action to enhance the color of an object.
I usually subtract all the contaminated colors (yellow of light, blue, etc). However, when I increase the color with the action, the problem occurs that the color is contaminated with blue and pink.
My friend and I did the same thing and got 2 different cases.
I temporarily fixed it by white balancing (auto) before subtracting the color but I still don't understand how it works. So I am writing this article to consult everyone's opinions.
Thank you for all the upcoming comments.

 

Correct answer davescm

Are those screenshots or saved images?

I just tried a colour balance of mid tone +4, 0,-6 on your middle (grey) image and saw no such colour issues.
If they are screenshots, I suspect you are seeing banding in your display system which is probably 8 bit (as well as the image being 8 bit). Here I am viewing on a 10 bit/channel display and see no issues.

Try this. At the first step convert your image to 16 bits/channel. Carry out the remaining steps in 16 bit. If you are still seeing such colour issues then it is definitely your display which on an 8 bit system can show stepping in individual RGB channels which can be very visible as discolouration when close to neutral. If it is just your display though - the actual image should be OK though as working in 16 bit avoids such visible stepping.

 

Dave

1 reply

D Fosse
Community Expert
D FosseCommunity Expert
Community Expert
April 2, 2025

You need to explain this a lot better. Start by showing a problematic image that you want to improve, and in what way you want to improve it.

 

Your action will just shift color balance slightly towards orange. That's all it does, it will not "enhance" or "increase" color.

 

    I
    IshigamiAuthor
    Participating Frequently
    April 3, 2025

    Basically, you can see that this photo is yellow, normally I just need to subtract most of the color to get the white wall back. Then I changed the color balance a bit like you said to make the wall look warmer. The problem here is that the gradation is not uniform, you can see the green and pink in the photo. And I want this gradation to be uniform, but sometimes I can do it, sometimes I can't.

     

     

     

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    April 3, 2025

    I am not sure I follow, could you provide the layered file so one can see which exact Adjustment Layers and settings you used? 

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