[magick-users] Suggestion to Digital Photo Handling section, part 3

[- Tong -]

Hi Anthony,

On http://www.imagemagick.org/Usage/photos/, in Photo Conversion
Cookbook section you have two examples on converting photos to
sketches -- "Childrens Color-In Images" & "Pencil Sketch".

Before going into these, maybe it is a good idea to first discuss
convert's built-in -charcoal operator, just to make it a full
story, because there might be people who don't know of the operator. 

Taken from 
http://www.ibm.com/developerworks/library/l-graf/?ca=dnt-428

The charcoal effect simulates a charcoal artist's impression of the image.

    $ convert -charcoal 2 input.jpg output.jpg 

Moreover, when I apply the Childrens Color-In Image method to a
portrait photo, it did not work well.  I know that the Childrens
Color-In Image method was originated from a long discussion about
Generating Coloring-In Pages on the IM Users Forum. So I'm
thinking, let's try another algorithm.

What I really like to see in the Photo Conversion Cookbook
section, is an example for "Simplest Sketch", ie, convert the
photo to a sketch that has bare minimum lines to represent the  
original photo. I found a very good algorithm from the gimp
tutorials section. 

http://www.gimp.org/tutorials/Sketch_Effect/

To be honest, I was just stunned by how good the effect can be. I
had been trying to achieve the same result in gimp long time ago
using my limited understanding/knowledge but failed. Looking at
how a machine can do in just several simples steps, I have to say I
was amazed. I think that's a very effective algorithm, but I don't 
know how to do it in IM. 

Please help. 

thanks


-- 
Tong (remove underscore(s) to reply)
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