View Full Version : Black Levels


Simon Denny
August 18th, 2007, 04:54 AM
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.

Cheers
Simon

Douglas Spotted Eagle
August 18th, 2007, 09:35 AM
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

Glenn Chan
August 18th, 2007, 11:20 AM
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.

Douglas Spotted Eagle
August 18th, 2007, 11:29 AM
Good catch, Glenn. I'd not see the 255, I guess my eyes read it as 235 once I saw "16" in there.

Simon Denny
August 18th, 2007, 12:26 PM
Sorry i mean 235

Thanks
Simon