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How to flip Brightness and preserve color in Photoshop?


Question

as the title is saying. Using Photoshop, I want to invert the luminosity of my image using adjustment-layers, while the colors stay the same.

So here is my example image:

enter image description here

  • Dark Background (it's totally black in this example)
  • Light Text (it's totally black in this example)
  • two glowing edges

To explain it a little further. The expected result based on this image should look like the following: enter image description here

  • White Background
  • Black Text
  • Colors are the same

The Problems

I don't know how I can prevent the colors from being manipulated as well.
If I try to invert the image with an Invert Adjustment Layer with the blend mode of luminosity (which is the last in the list) it won't give me the desired result.

enter image description here

As you can see here, the Hue of the glow is still the same.
But the brightness has been flipped too.


I also tryed to calculate Channels in LAB-Mode and could not come up with a decent looking result.


The Solution

I don't want to manually select the text & the shape and fill it with the opposing color. That destroys the edges and looks awful.

Quick thought at the end: I need an selection by saturation if that's possible ... ;-)

2016/07/07
1
9
7/7/2016 8:41:00 AM

Try the following to see why this doesn't work;

  1. Open your image
  2. Go to the LAB channel mode
  3. In your channels look at the lightness channel (L)
  4. This is your image stripped off all color
  5. If you invert this you will see you get pretty dark shadows
  6. no colors have been manipulated here, only the luminosity
  7. therefore > the problem lies with the luminosity.

You simply get shadows that are too dark.
This layers example should get you close.

enter image description here

2016/07/25
4
7/25/2016 2:06:00 PM