Steps between the darkest and brightest image parts) that is increased It is only the quantization (the number of lightness Popular belief, extended range encoding does not provide a higherĭynamic range. An image encoded in 10 bit legal range has a code value rangeįrom 64 to 940 (876 code values), and a 10 bit extended range signal hasĪ code value range from 4 to 1019 (1015 code values). However, the difference between legal and extended coding areĮssentially academic, and will not have any effect on any real world That an extended range ProRes file can result in clipping in some Apple (this undocumented change in MC frustrated me for nearly a year, as I thought MC post 7.02 was handing it wrongly.)Īpple specifies that ProRes should be legal range. as these add a legal to full swing change, indeed this is why the Alexa always produces legal Prores 444 QT's. My experience is that AMA linking and inporting into MC does not alter levels or Gamma, as long as you steer clear of adding any kind of lut or other modifying actions.Īlexa Prores 444 will look flatter in MC post MC7.02 than in QT, Assimilate Scratch, Resolve etc. The file was worked on and prepped by a different company before coming to us.Īny suggestions on how to make Avid not alter the gamma or levels ? I know the original footage was shot on Alexa, but switching to Alexa levels doesn't help - all the black levels and colours look wrong. I tried AMA linking and changing the source settings. When I took the original quicktime into Premiere, everything was fine - no shift.ĭoes anyone know whats going on? Having to convert in Mpeg Streamclip before ingesting into the Avid is very time consuming - especially with multiple files. It's almost as though there were some sort of LUT or something attached to the quicktime and Avid threw it away, but other programs held onto it. In this way, the color levels were maintained and Avid didn't shift them. I was able to fix the issue by converting the quicktime to be an Avid DNxHD115 quicktime with Mpeg Streamclip, before I brought it into Avid. I did tests where I imported other quicktime clips and they didn't have the same issue. When it is exported from Avid, it is still milky. The video appears to have proper black levels when played in Quicktime player or in Mpeg Streamclip, however the moment it is either imported or AMA linked to Avid, the image instantly goes very noticeably milky. The quicktime is in the format libquicktime (which I am not familiar with). I have a file that Avid is shifting the gamma on (or doing some similar levels conversion).
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