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Chroma out of Spec?
Hello folks,
I am running into a repeated problem. My SD Digibeta Masters are getting rejected in QC for having “Chroma out of spec”. The SD Digi’s are down-converts from a HDSR Master. We use a “Proc” to make it all Broadcast legal, but even still, stuff like red car lights at night can get through.
So my first question is; Does anyone know of any equipment to clamp the “rouge” highlights that sneak by the Proc. My quick fix has been to do tape to tape inserts and crank down the whole shot with the offending chroma, it’s not really ideal.
My second question is; when I’m looking at the trace on the vectorscope it all falls well within the graticule… BUT, I also see a large faint ghosty glow around the trace. (the bloom?)
Some of this very faint glow is out of spec. Does this faint glow have to be entirely within the raticule to be in SMPTE spec?
Thanks,
Chris -
2 Replies
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FCP’s Broadcast Safe filter does a lousy job of chroma/saturation protection so don’t rely on that.
Magic Bullet’s Colorista has a really nice mask feature that I use a lot to mask out reds in the scene so I can drop them down without affecting anything else.
FCP’s 3 Way Color Corrector does have color limiting so you can limit the saturation reduction to just the red you’re targeting.
Of course, Color will keep you broadcast safe. Once you set that, you can pretty much do whatever you want and Color will clamp everything at whatever you set the ceiling to.
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.All Things Apple Podcast! https://cowcast.creativecow.net/all_things_apple/index.html
Read my blog! https://blogs.creativecow.net/WalterBiscardi
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[walter biscardi] “FCP’s Broadcast Safe filter does a lousy job of chroma/saturation protection so don’t rely on that.”
Walter I thought you stated in another post that you color correct your shows, then add the broadcast safe filter as part of your post process.
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