New answers tagged line-art
Faux-sketch is very demanding. The interest lies in the question of what is a sketch? Often it would be drawn on paper with a pencil and focuses on the outlines of objects and some shading/texturing, like what you submitted. I have made a few experiments(top right is source): With Gimp, Edge Detect/Edge can be a useful filter here(then invert the result) ...
If you're looking at the left side wood grains and how those disappear, your best bet is retracing those on the sketch itself. If the sketch is not available, or you just really refuse to do it, back off the contrast and zoom in and use your favorite tools to cut out or trace them by hand in-program.
Try this trick, hope it helps...: With the photo newly opened in Photoshop, press CTRL + J(Win) / COMMAND+J (Mac) to duplicate the Background layer Press Shift+Ctrl+U (Win) / Shift+Command+U (Mac) to desaturate the layer Press CTRL + J (Win) / COMMAND+J (Mac) to duplicate the desaturated layer Press CTRL + I (Win) / COMMAND+I (Mac) to invert the layer ...
use the free script Created by Hiroyuki Sato called "Join Reasonably"
Are you scanning your sketches? Your scanner may be able to reduce some of the extraneous noise and provide you with clean line art. Failing that, I'd recommend using a Levels adjustment layer. I was able to do this in a few minutes with levels and a quick mask with the magnetic lasso:
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