This is a continuation of a discussion started on the "ebooks we're working on" thread:
Quote:
Originally Posted by SBT
Since that posting, I've discovered the wonderful world of the G'MIC plugin for GIMP, which can make a lot of difference, especially for line drawings.
G'MIC offers an overwhelming number of filters. Which ones are best suited for the rehabilitation of line drawings and what settings do you usually use?
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My aim when restoring a scan of a line drawing is:
- Remove noise.
- Increase grayscale range, i.e. make the white parts white and the black parts black.
Short walk-through with gimp with G'MIC plugin installed:
Used
this image from "First crossing of Greenland", F. Nansen.
- Crop image
- Select Colors->Desaturate: Luminosity
- At this point, I used to just clip the greyscale range using Colors->Levels. Problem is, this easily either removes bits of the drawing, or leaves noise in place. So..
- Select Filters-G'MIC:Smooth->Bilateral. You can reduce the default settings if you like, one iteration is probably sufficient. Click "Apply"
- Still in the G'MIC window; select Details->Sharpen[Inverse diffusion]. Click "OK"
- Now, go to Colors->Levels, and reduce the range to make the white bits white and the black bits black.
