Image processing, highlighting hidden details

[Bernd]

It's not as good as my spray plaster wall for induced pareidolia.

I am not seeing anything deliberately human-made in the corner of You are not allowed to view links. Register or Login to view. either.

In my experience, a good method for such comparisons is to create a layered file with the original image as background and the processed image as overlay, then fiddle with transparency back and forth. A n animated .gif or .png blinking between original and processed image can also be useful for display.