To create a vectorized sketch from a photograph for a brochure or for use as a logo:
- Open the photograph in Gimp and create a sketch of it as described in the following.a Please understand all values as suggestions only. Feel free to experiment. :)
- Image/Scale image (150–300 dpi)
- Ctrl-Shift-D (duplicates the layer)
- Filters/Blur/Gaussian Blur (typically 2% of the dimension of the image)
- set opacity to 50%
- right-click on layer, Merge Down
- Colors/Levels, set to 100–155
- Colors/Levels, set max to 128, play with Gamma
- Save aA script called quick-sketch is available, but the above gives you a higher degree of control.
- To vectorize this sketch, open it in inkscape via the File/Import feature. Then …
- … resize page to selection via Ctrl-Shift-D (Document properties)
- Shift-Alt-B (Trace Bitmap)
- Mode: Grays, check stack scans
- Options: suppress speckles 25, smooth corners 1, optimize paths 5.
Here's an example created by the above procedure:
PS: If you don't see an image above, try another browser. Opera 11, IE 9 and all current Webkit incarnations (Chromium, Safari, Konqueror, Uzbl, Midori …) support svg as image format. Firefox will support it in the soon-to-be-released version 4.