Photoshop Miaoshouhuichun-Reversal of opacity

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I had mentioned this idea two days ago, I was dismissed as wishful thinking, almost give up!

As shown below, what we want to do is to remove the translucent layer (a large and complex watermark) and restore the original image. (Note: The operation of the following layer is actually an RGB value operation)

It's like we go from one place to another, and the safest way to get back is to go back down the road. Let's see how we get here! Opacity blending principle: overlay layers are mixed with X-percent opacity and bottom graph, and the resulting blend is equal to overlay layer multiplied by x percent plus bottom graph multiplied by (1-x%).

How to walk back to the self-evident: the bottom of the map is equal to the mixed diagram minus the overlay by x, then divided by (1-x%), but we can only find the cover layer of the original, and do not know how much opacity it is mixed? It doesn't matter, we'll find out the opacity later.

Drag the top of the overlay (layer 1), complete alignment with the watermark on the graph, put it below, and set the blending mode of the layer (layer 0) to the difference.

It's so scary, what's less! By the way, the effect of opacity has not been added, and you have to multiply the layer 1 by x percent. There are at least two ways to do this, levels of output levels or hue saturation inside the brightness (if you are familiar with the color theory and the two adjustment tools, you should know why), the output of the right side of the slider to move slowly to the left, the watermark slowly fade, until disappear, stop! Is here 166, this is known, the original opacity x is 166/255 or 65%!

It's a good time to do it now! As long as the watermark part by dividing (1-65%) can restore the original, the top plus a level adjustment layer, but instead of input levels, since we know the opacity, the right value can be directly entered 255* (1-65%) = 89.

The only thing left is a seal.

To sum up, what we get in this process:

⒈ reverse thinking, and I adjust the color of the post, but this more accurate!
⒉ the mixing principle of opacity, this seems very few people mentioned.
Flexible application of ⒊ layer blending mode.
Depth understanding of ⒋ (if you think carefully)