NOTE: I'm a systems administrator, not a graphic designer, so I'm a total n00b when it comes to image manipulation.
That being said, I thought this would be the best forum to ask this question:
I am setting up a terminal server farm where the desktop shows our corporate branded background image. The problem is that the RDP session is limited to 16-bit color, and it creates a visible and annoying vignette pattern in the image which looks unprofessional.
Is there any way to downsample the image to a 16-bit color palette and use dithering to reduce the color banding in the image?
I'd rather use GIMP since it's free but I can borrow a computer with Photoshop in it if I have to.
I cross-posted this question on Server Fault and got the following information:
"5/6/5 has always been how Windows has handled 16-bit video modes (at least, in my memory) so I'd be inclined to grab a Photoshop filter that dithers to 5/6/5 format and tweak from there."
Is there such a filter in Photoshop that I can use?