Reference

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sketchbw

Arguments:

Description:

Apply sketch effect to selected images.

Default values:

nb_angles=2, start_angle=45, angle_range=180, length=30, threshold=3, opacity=0.03, bgfactor=0, density=0.6, sharpness=0.1, anisotropy=0.6, smoothness=0.25, coherence=1, is_boost=0 and is_curved=1.

Example of use:

$ gmic image.jpg +sketchbw 1 reverse blur[-1] 3 blend[-2,-1] overlay

Command: image.jpg +sketchbw 1 reverse blur[-1] 3 blend[-2,-1] overlay