I use FireFox 3.6.13 which loads the exact same images and prints them properly in shades of black and white; that is, grayscale.
I also have Gimp2 which loads the exact same images and prints them properly in shades of black and white; that is, grayscale.
Internet Explorer also puts out proper grayscale prints from the same grayscale images.
How do I switch PMV to grayscale instead of muavescale?

JimL