Quote:
Originally Posted by Tex2002ans
Sadly, I don't think you will be seeing century-old Mark Twain illustrations as SVG. 
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Hmm, sketches and etches should be translatable into a vector space, though... Individual strokes in a sketch are normally identifiable (unlike brush strokes), and presumably can be approximated by a limited number of parameters defining the properties of the stroke... And quite some research has already gone into stroke recognition as part of OCR on handwriting.
Could be an interesting research project...
Until then, the only time I vectorize images is when they have clearly defined silhouettes, and even then I only do it if there's a cover image I want to look extra nice.