save image as PPM-file
eppmwrit(filename,image,colormap[,binary])
filename :
name of PPM-file
image :
matrix for image
if colormap=-1 then
image is filled with RGB values
(value=R*2^16+G*2^8+B and R,G,B are integer of 0:255)
else
matrix is filled with indices of colormap
colormap :
color table
binary :
default: binary=1 for binary PPM-file
binary=0 for ascii PPM-file