>Is it a way to compute IM's colorize parameters from the Gimp's colorize
>ones in order to get the same result?


IM -modulate has different ranges for Brightness, Saturation and Hue, 
but I don't think it will colorize the way you want.

see -modulate at 
http://www.imagemagick.org/script/command-line-options.php#modulate

The other ways to do that are to:

use -tint, see http://www.imagemagick.org/script/command-line-options.php#tint

or

use +level-colors, see 
http://www.imagemagick.org/script/command-line-options.php#level-colors


Also read the sections on those at http://www.imagemagick.org/Usage/color/




This is kind of close. You can adjust the two colors in +level-colors:

convert testtext.png +level-colors black,'rgb(255,200,255)' 
testtext_lc_black_rgb255x200x255.png

or pick some named color. see http://www.imagemagick.org/script/color.php

See the color converter link near the top to play with colors.

Fred


P.S.

See also -colorize at 
http://www.imagemagick.org/script/command-line-options.php#colorize


This also works.

convert testtext.png -fill "rgb(255,200,255)" -colorize 50% 
testtext_colorize255x200x255.png
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