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Image processing is the computational transformation of an image signal. It's about the technical side of batch transformations, conversions, and enhancements, as distinct from post-processing (adjusting an image to achieve a desired look, probably using image processing).

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What software tool can I use to convert a photo to line drawing?

Do you want a bitmap image that looks like a drawing or do you want to vectorize the image? To create a drawing effect, there are several filters for GIMP that will do that into some extent. Many si …