A while back I was curious why the Safe Color Limit effect from my work system Mac Pro 12 core upgraded mid 2010 OS 10.9.5 SNDX Avid 8.5.2 responded differently and elevated the black level substantially on my home system a Mac Pro mid 2012 12 core with a DNxIO Avid 8.5.3. Dave H confirmed that the Safe Color Effect responds differently with Avid IO hardware vs. 3rd party IO.
The other quirky thing I found was that setting RGB limits to 16-235 actually raised the black level slightly above 0 mV. The same behavior happened on the Nitris system at work. I also found on the SNDX system setting the Luma L parameter to 7.5 caused the same slight elevation in black level and on my home system the same thing happened if I set Luma L to 0 ire. In both cases lowering the Luma L -.1 ire eliminated the black level elevation. On the SNDX at work a setting of 7.4 worked and on my home system setting luma l to -.1ire worked.
Needless to say this makes bouncing between home and work problematic as I have to alter the safe color effect parameters between the systems.
This black elevation was noted by QC but only in the black sections of the show as it is so slight it isn't apparent in normal video signals and they didn't reject it but I'm surprised the type of hardware has a back effect as to the actual media Avid is rendering. Given QC is looking at a file whatever safe color limit effect interaction there is with the type of IO hardware it seems to effect resulting files.
I'm trying to remember which setting had the parameter for adding 7.5 ire to composite out. I wonder if that would have some effect on this behavior.
I haven't had a chance to bounce back to my 6.5.4 startup disks to see if I can duplicate the behavior in project other than 4K 4096x2160. Anybody else seeing the slightly elevated blacks in safe color limit effect. Very annoying. Maybe it's just in 4K world as I think I would have noticed this behavior over the years. I have seen strangness in the 7.5ire vs. 0 ire setting before years back but never sussed out what was behind it.
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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this is the Avid-L2
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