mesard@bbn.com (Wayne Mesard) (07/18/89)
I am interested in purchasing a board for the Mac II which will allow me to project graphics on top of video images which would (of course) be fed in from an external NTSC device such as a videodisc player, VCR, video camera, etc. The brochures I have from various video board companies are less than clear [to me at least] about whether they can do what I want. Any pointers, references to products, or other information would be appreciated. * The overlayed image can be displayed on the Mac monitor or on an external video monitor, but on-the-Mac would preferred (subject to the concerns listed below). (Some boards export Mac graphics while others import video images (the so-called "frame grabbers").) * Real-time (30 frames per second) or near-real-time image display is not necessary, but would be preferred. However, I must be able to grab an image and display it in < 5 seconds. (I gather that a number of the less expensive frame grabber boards fail this test.) * It's unclear how significantly the image degrades when going from video to Mac. (Here, I'm more concerned with the different pixel density than the loss of color information (which is subject to the pixel depth being used).) -- unsigned *Wayne_Mesard(); "A thousand pounds?! That's almost a ton!" Mesard@BBN.COM BBN, Cambridge, MA -MS