I want to make everything that is 50% Gray in Photoshop trasnaprent.
Black and White should be 100%, but all in the middle transparent.
Let’s compare these to images to demonstrate:
Yes the checkerboard is part of the image in order to illustrate which effect I want to accomplish
I would like to do it mathematically exact, rather than faking it.
Going off your image:
- Middle Gray is 128, 128, 128
- 1 stop Lighter is 191, 191, 191
- 1 stop Darker is 64, 64, 64
So adjust the Blend If slider accordingly:
If you want it to look more like your “Goal” though it’s not actually only removing 50% than adjust the sliders to your liking.