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Old August 18th, 2007, 05:54 AM   #1
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Black Levels

What do most people do with black levels?
Would you let then clip and then insert a Broadcast Filter or would you use the levels filter and rise the black level just above clipping 16 (for those in RGB 16-255 LAND)

I'm doing tests with some stuff and now i'm lost as to what looks right and would like some feedback on what others might do.

Also i know it depends on the footage taken and the look of the video your after.

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Simon
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Old August 18th, 2007, 10:35 AM   #2
 
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B'cast filter, or Black Restore (for MPEG delivery), color curves...lotsa answers to this one. Setting levels first is usually a good practice, unless you've got a specific under exposure effect you were looking for
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Old August 18th, 2007, 12:20 PM   #3
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1- Er... there is no 16-255 LAND. In Vegas, the video-oriented codecs (DV, HDV, MPEG2, etc.) tend to use studio RGB range (16-235 is where the legal range is). While the computer-oriented codecs (e.g. windows media) and Quicktime use 0-255 levels (computer RGB).

The studio RGB codecs want to see 16-235 levels, and the computer RGB codecs want to see 0-255 levels.

2- If there is noise in your image (e.g. compression noise), this will push values below 16. This is ok.
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Old August 18th, 2007, 12:29 PM   #4
 
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Good catch, Glenn. I'd not see the 255, I guess my eyes read it as 235 once I saw "16" in there.
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Old August 18th, 2007, 01:26 PM   #5
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Sorry i mean 235

Thanks
Simon
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