Maps printing with D530 printer are not dark enough to see the streets

I want to print out a street map which I pulled up on google.  So I make an image of the screen with the street with Snagit and then I print the image with the maximum density on the printer but on the printout the streets are too faint to see.  Is there any way to print these maps darker?  I am using the maximum density on the printer.  There doesn't seem to be any setting in Snagit for darkness.