NAME
econtra - change contra of colormap
SYNOPSIS
newColormap=econtra(colormap,contrast[,colorChannel])
PARAMETER(S)
colormap color table
contrast -200 to 200 per cent
newColormap changed color table
colorChannel vector of Channel; 1=red, 2=green, 3=blue
e.g. [1 3] = Channel red and blue
default=[1 2 3]
Stefan Mueller
2003-01-13