- My setup is: ArtistX Linux (modified Ubuntu). Acer e-cmachin EMD-644 AMD APU
powered laptop. It has less than 25 watts of power consumption.
- GIMP 2.8 or above if available. 2.6 will also work.
- Basics of GIMP.
- Take a picture of your sketch using good camera as clean as possible with big contrast ratio (means dark and bright should have higher difference).
- To get good contrast use plain white paper and black ink.
- To get regular, uniform surface try putting a glass panel over the paper. Make sure that reflection does not disturb the shot Or simply use a scanner if you have one.
Start GIMP and load your sketch. Make a copy of original layer, set original invisible and locked. Work on copy.
- Click: Colors => Threshold => Move the slider to choose the best output you need.
- Try to remove noise/unwanted colors by using other options like Brightness-Contrast, Levels, Curves, Desaturate. Then try step 1 again.
- Click Filters => Artistic => Photocopy.
- Play with mask radius to get how much sketch ink you want in output.
- Keep sharpness higher but its not a rule in every case.
- Keep % black and % white higher to almost 100%. i.e. 1.0
- Color => Auto => White balance, normalize, Stretch contrast, HSV.
- Color => Color to Alpha => Select the color of paper. Find color of paper using color picker.
- Filters => Enhancement => Unsharp Mask. Play with radius and little bit of other options.
- For some cases: Filters => Blur => Pixelize and unsharp mask (above) can be used in respective order to get nice results.
I hope this helps in your sketch work. If it helped please say thanks to GIMP first :), its opensource and needs lots of support and funds. Least we can do is to make it grow!.
Download this tutorial in PDF format for offline use and printing:GIMP_for_digitalization_of_sketches.pdf.7z
How to convert sketch into digital image, convert paper into digital black and white format, sketch digitization, digitalization.