DVD slideshow GUI question

I have been trying out DVD slideshow GUI and it is quite a nice program. However I noticed that the displayed photos were a bit light.

I have mentioned this on the DSG programming forum & supposedly the colors are made broadcast safe. However a black slideshow border does display as black, but a black photo displays as dark gray. The two blacks are being processed differently. The developer has been busy and is taking a much needed break so I thought I would check over here.

Has anyone else noticed the lack of true (or almost true) blacks? If so, is there a temporary work around in order to correct it?