Hello everybody, I've set background color of the image (in map file) as black and I use white or light colors to display lines. There is a reason: raster orthophotos or satellite images are usually quite dark and so it's better to overlay layers with light colors.
I ask if you know a method to invert color images when I send map to print, the best would be in this way: when R G B assume the same value (grey tone) then invert, else leave the color as it is. Thank you bye, toni
