# Exemple http://gmic.sourceforge.net/tutorial.shtml
# This way of increasing contrast is often called contrast_stretch

# appel de la commande par :
#                            gmic -m contrast_stretch.txt image.png -contrast_stretch 15%,85%,-15%,115%

#@gmic contrast_stretch : cut_low[%], cut_high[%], normalize_low[%], normalize_high[%] : Stretch contrast of image.
contrast_stretch :
-e "Stretching contrast of image$?."
-v - -repeat @#
-c  $1,$2 -n $3,$4    
-mv[-1] 0 -done -v +