ImageMagick 6.3.0 Beta (available sometime tommorow) has an enhanced -fx option
which includes ternary conditionals, assignments, and statements. Anthony,
for example, uses these features to create a radial gradient:
convert -size 100x100 xc: \
-fx 'xx=i/w-0.5; yy=j/h-0.5; rr=sqrt(xx*xx+yy*yy); 1.0-rr*1.42' \
radial-gradient.gif
A basic angular gradient illustates a ternary conditional:
convert -size 100x100 xc: \
-fx 'aa=atan2(j-h/2.0+0.5,i-w/2.0+0.5)/PI/2.0; aa > 0.0 ? aa : aa+1.0' \
angular-gradient.gif
See http://www.cit.gu.edu.au/~anthony/graphics/imagick6/canvas/index.html
for further examples. See http://magick.imagemagick.org/script/fx.php for
a discussion of the -fx expression laguage.
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