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Need blacker than black
Hey, so I’m delivering a clip and have been told that the black portions between my clips need to be at least -15mV (right now they were delivered at 0mV). I’m using the a black video clip generated in PP 5.5. I’ve added a level filter to the clip and raised the incoming BL to 25 and, for good measure, added a brightness/contrast filter and dropped the brightness down -35.
Unfortunately there isn’t a scope that will show me blacker than black (or at least one I can find). Will adding these two filters drop the black level of this black clip down where they want it? It doesn’t have to be perfect, it just has to be lower than 0mV.
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6 Replies
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This is a strange request: digital files do not have anything that could be measured in millivolts, digital files are numbers.
It sounds like they want a digital file that corresponds to SMPTE levels, where 15-235 corresponds to 0 and 100 IRE, but millivolts only appear in once your file is output into electronics of some sort.
Some clarification is in order, methinks. Like: what is the file format they are asking for? And what video system (PAL/NTSC?)On the other hand, if you are delivering on tape, then mV are relevant.
-jeff
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It’s a picture in picture stream that was being laid off to HDCAM SR. Historically (I’ve done about 6 of these for Blu-ray) a straight 0mV black level has been fine, but this time they had a very specific spec that needed to be met (I assume to create an alpha for everything below a certain level of black). I adjusted the level filter as well as decreasing the brightness on the brightness/contrast filter and when we pulled it up on the scopes this morning it was registering sub 0, so it worked. I was just flying blind until then. Thanks for the help, though.
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Ah, tape! Then it makes sense. Glad it worked out OK. My guess is like yours: the superblack is used for alpha-channel-like needs.
-jeff
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WOW! I haven’t used super black since 1991. That’s old skool.
Brian Mulligan
Senior Editor – Autodesk Smoke
WTHR-TV Indianapolis,IN, USA
Twitter: @bkmeditor -
That’s why I was so baffled. It isn’t a request I get everyday (or even every 5 years).
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Yes… Premier has built-in scopes. Just open up the dropdown menu on the Program screen…
Dave Speace
Producer/Director/DP
DZP VideoWindows 7, 64 Bit, i7 8 Core, 16Gb Ram, GeForce 4800
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