Create lineart from color images

[RyanBram]

When looking for vectorization process, I found a software called mkbitmap by Peter Selinger. It's function is for creating bitonal image as an input for potrace. The following is what the sotware can do :
Original


Thresholding without highpass filter

Code: Select all

mkbitmap -x -t 0.5

Thresholding with highpass filter

Code: Select all

mkbitmap -x -f 2

Are there an equivalent function in ImageMagick especially the one with highpass filter?
Because those function will be useful for creating coloring book for my student by using pre-existing color images.

Regards,
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See also
mkbitmap man page

[snibgo]

IM contains many operations (sch as "-edge") that may be combined to do this. I wouldn't be surprised if fmw42 has a script for this: http://www.fmwconcepts.com/imagemagick/index.php

[fmw42]

This works reasonably well for me on your original color image. Lines are a bit more discontinuous than in your other software.

Code: Select all

convert loxie-orig.png -negate -separate -lat 5x5+5% -negate -evaluate-sequence add loxie_edge.png

see
http://www.imagemagick.org/script/comma ... ns.php#lat

you can play around with the arguments to try to tweak it better.