I have that,... we have a Matrox MXO, we capture DVI OUT from the computer, transmits in 1920x1080 i from the MXO, (indiferent of the resolution on the computer (like 800x600) and then capture with the Blackmagic HD on SDI in 1920 x 1080i ( Works PERFECT)
The only issue is,.. Matrox MXO only capture DVI from a MAC Computer, has a little software ans a USB connection on that,... and that little software on the computer presentation is MAC ONLY
As far I LOVE Macs, the world is not only them, The client likes to make theier on presentation sometimes, and they all have windows ( I don't know why?)
Anyway, also with MXO, the bordr of the letters is little be soft. Looks like the projection is little Unfocused. BUT works like a charm on HD capture.
Thanks a lot