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Lumi Shift on .mov export.
I know I have read about this somewhere on the cow before but search results have comeback empty.
Quick Facility workflow background: Network promos are being cut with both Avid Adrenalines and FCS suites. The promos are then exported into uncompressed quicktimes and fed into a Rhozet compression tool that then compresses them into an Omneon readible format and transered to our Networks Operations Center via ftp which go directly into th e Omneon playback server.
In the initial quicktime export from the Avid machines a lumi shift is occuring causing our spots to become illegal. Everything coming from the FCS boxes show no changes.
As I mentioned I have searched the cow and the web looking for a solution. I have read a few tech docs but nothing seems current. I doubt we are the first facility that has encountered this problem so somehere there must be a viable workaround.
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4 Replies
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In which direction is the shift occuring? In the encoder, it is assuming 16-236 RGB range or 0-255?
Michael
anything 24fps
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I have a color effect saved for this but it’s for quicktimes coming back in from AE. Never thought about how much that little change the brightness feature could bag those sending to automated encoders.
Are you spitting out uncompressed quicktimes because of the buggyness requiring mixdowns for use of QT references? You could try over compinsating a reference and see how much is washes it out once bogusly exported.
Most encoders will let you set an ire limit but again, you’d be washing it out a bit.
I’d like to know the true fix to this one as well.
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The shift is going from 0-255 and bumping the blacks up to 7.5 and the whites around 110.
Our graphics package has alot of blacks so the Graphics Dept. is concerned their design is being beat down because of this.
QT ref files will not work with Rohzet and our NAS Editshare system. I have tested this in so many different ways my head is going to spin off. I have done more research on Rhozet and have since learned Rhozet does not require a specific quicktime codec. I will test different .avi’s as well as Meridian codecs that are native to the Avid on the PC platform.
Thanks for your comments thus far.
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Hey,
I have been getting this problem as well! When I export from avid as a quicktime reference file it is much brighter than what I’m seeing in avid.
I have tried exporting with diffrent settings and some are a bit better, but all are still brighter than what the avid shows me.Whats going on?
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