convert matrix to image
[image colormap]=emat2img(matrix[,colormap[,scale]])
matrix :
matrix for image
colormap :
define own colormap
scale :
scale vector of legend [start step end]
special cases of scale vector are
if start=0 and end=0 then autorange=on
if step=0 then autoscale=on
(default scale vector=[0 0 0])
image :
created image