in imagemagick:
convert -fill "#ff8000" -colorize 50 gray_image.png sepia_image.png
from this tread:
http://studio.imagemagick.org/pipermail/magick-users/2002-November/006230.html
http://studio.imagemagick.org/pipermail/magick-users/2002-November/006236.html http://studio.imagemagick.org/pipermail/magick-users/2002-November/006235.html
About making filters: http://ez.no/community/forum/suggestions/more_image_filters_text_on_image
