From the section :
http://www.imagemagick.org/Usage/color_ ... dulate_hue
I edited the lines to fit your image that was uploaded.
convert YPuLOBp.png -modulate 100,100,0 YPuLOBp_mod_hue_0.png
convert YPuLOBp.png -modulate 100,100,33.3 YPuLOBp_mod_hue_33.png
convert YPuLOBp.png -modulate 100,100,66.6 YPuLOBp_mod_hue_66.png
convert YPuLOBp.png -modulate 100,100,100 YPuLOBp_mod_hue_100.png
convert YPuLOBp.png -modulate 100,100,133.3 YPuLOBp_mod_hue_133.png
convert YPuLOBp.png -modulate 100,100,166.6 YPuLOBp_mod_hue_166.png
convert YPuLOBp.png -modulate 100,100,200 YPuLOBp_mod_hue_200.png
I'm new to some of the tricks but this one I noticed it when I was making a trip out background for a chroma screen, chances are your looking more for applying a color filter to have them all in the same range.
Only other goodies I found we're at Freds page
http://www.fmwconcepts.com/imagemagick/ ... /index.php Convert your image to grey scale then back to 3 color tints
or
http://www.fmwconcepts.com/imagemagick/ ... /index.php which gives you a hue wheel to work with.
Hope this helps or gives ideas to others to point you in the right direction