CompuServe Messages

PAR questions

    23-Aug-94 00:00:41
Sb: #119762-PAR questions
Fm: John Ellis 72440,3046
To: John Mateer [PolyMedia] 100116,343
John, I don't think the PAR conforms to 4:2:2 sampling. There is no mention of it in the literature. It does provide analog component output, but 4:2:2 refers to the weighted digital sampling frequencies used to digitize the Luminance and color difference Components (Y,Cb,Cr) of digital component video. The only system of this type that has 4:2:2 output is the MAX which uses the Illuminator Pro as its framebuffer. I don't think there is 4:2:2 sampling in the conversion process of the original image in either system before or after JPEG compression except through the framebuffer on the MAX. Which is not the same as true 4:2:2 sampling like on a CCIR 601 compatible device such as an Abekas. >>broadcast spec. << I've been around and around on that one too. <g> My interpretation of "Broadcast Spec" precludes the use of a JPEG compression scheme. At least at this time. However both systems output a legal NTSC video signal. (Provided the images have been correctly created.) Enough technical stuff! 🙂 You say several of the majoring VR authoring systems import 3DS files directly. What authoring systems are these? Do they render these files directly in real time? Is the system you're using proprietary? If I wanted to explore this area of animation creation what package would you suggest? (My turn for questions. <g>) >> I'm really amazed by the quality of stuff produced with 3DS… << Have you seen the recent Sig 94 Demo tape? There's some extrodinary work on it. I agree that the render quality of 3DS is superb. Let me know if you're still interested in the PAR, maybe we can work out something on the Micropolis. John