DVL-Digest 840 - Postings: Index color bars color bars - China girl Length of y/c cable color bars - "Perry" Jeff Lynch is perfectly correct in his protestations, I've obviously been misunderstood. I am just trying to make the point that for an amateur or occasional pro user who maybe only has a single decent video monitor, it is very difficult to set it up using color bars. Our brain just isn't designed to be very accurate with saturated colors. We ARE designed to be very accurate at assessing skin tones, probably by evolution in deciding just how angry your enemy is! So by all means use color bars when you can compare them on a scope, but for comparing two pictures on a monitor you will be much more accurate using a well known face. It is a similar story with audio, tones are great for meters but otherwise you are better comparing levels with a well known voice. Perry Mitchell Video Consultant http://www.perrybits.co.uk color bars - China girl - "Perry" I didn't know of this tradition. It's interesting because I have got into the habit with my published pro camera reviews of using a still life that includes one of my daughter's dolls. This is mostly for convenience and repeatability, but I have found the doll remarkably accurate at showing up the subtleties of camera color matrix designs. Unlike a real model, if she looks a little flushed it is definitely down to the camera and not due to a personal condition! Perry Mitchell Video Consultant http://www.perrybits.co.uk Length of y/c cable - "Perry" >Also, in reference to my original question: I realize that you can run them pretty far - my question is how far before there is a noticeable loss of quality? I'm doing dubs of my demo reel (DV to VHS) so I need to get good quality results.< Length of video cable is mainly controlled by 3 factors: 1) Loss of high frequencies, particularly at chroma subcarrier. 2) Differential Y/C delay. 3) Ghosting caused by reflections. If you use high quality, properly terminated broadcast type video cable (it is about 0.25 inch thick) then experience shows that losses over the first 100 feet are minimal. For a Y/C cable, you'll need to convert as soon as possible from the normal combined cable to twin BNC type, and you need to exactly match the length of the two arms. Personally I wouldn't run the normal Y/C cables more than a few feet but it obviously depends on how they are made. Perry Mitchell Video Consultant http://www.perrybits.co.uk (diese posts stammen von der DV-L Mailingliste - THX to Adam Wilt and Perry Mitchell :-) [up] |
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