: How to do line optical illusion art effects? I was wondering how I can do this type of optical illusion. Is it done manually or is there a quicker way to do it. Thanks ahead of time.

@Becky351

Simulate the old bw photo printing system. There dot sizes or line widths are modulated by local greyshades.


have a bw photo as a layer
have a pattern of black lines or dots on white. The pattern is your major line art and the printing raster at the same time. The illusion is the simulated greyshades.
blur the pattern. A slight zone of black and white should be left.
adjust the curves to get uniform shift from white to black in the blurred pattern
copy the blurred pattern to the layer mask of the photo, invert the mask!
insert a white background
make a safety copy of everything to be able to readjust and try again
merge the background and the masked photo
choose proper foreground and background colors in the tool palette; black and white are good.
go to image adjustment "Treshold"
adjust the treshold for your taste


Overlay your original pattern to make the line art dominant.

Here are a couple of examples. The line art is a bunch of horizontal straight lines. First a noisy smartphone photo is hidden into the "art"



In this example a second piece of art is hidden into the same horizontal line art:

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