[magick-users] Convert photos for laser engraving?

[Anthony Thyssen]

George Vandenberghe on  wrote...
| As someone who doesn't do much with images anymore you should take my
| advice cautiously.   However the PBM file format is a simple way
| to represent black/white images one bit per pixel.   The only way
| to get grayscale with PBM is by varying the density of black and white 
| points.
| Look at the dithering options in convert for possible assistance.    However
| dithering does point density manipulation and lines are  a problem I've not
| worked with.  
| 
For dithering options, and expecially the later versions of IM that
allow user defined dithering threshold maps, see..
  http://imagemagick.org/Usage/quantize/#ordered-dither

I did a lot of work to get this up and running, and also allow multiple
color levels. though black and white dithering is still the default.

  convert logo.png -colorspace Gray  -ordered-dither o8x8 logo_bw_o8x8.gif


  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
 -----------------------------------------------------------------------------
   A Real Kiter doesn't get annoyed with line tangles.  Rather, he finds
   that sorting them is a relaxing passtime.  Line tangles involving many
   kites are a social occasion.
 -----------------------------------------------------------------------------
     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/