With "Find Edges," you can detect only the outlines from photographs and illustrations. In the case example, the photograph will be converted into a line drawing with only the outline. Screentone will be pasted to create a manga background-like image.
Open the ①Tool Select window and select ②Filter.
Select ①Adjust Color and tap ②Find Edges.
Set preferences such as Algorithm, Smoothness, Black, White, and Intermediate value, then tap ①✓button.
Finally, add a layer with screentone pasted and a layer with the grayscale picture as the background of the line drawing.
It is now complete.
Picture provided by: https://publicdomainq.net/ginza-4-chome-crossing-covid-19-0049001/