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Problem with Importing 8-bit files as 10-bit
I’ve been importing 8-bit native footage to AE CS5.5 with Project Properties set to 10 bit. I am noticing that I am getting some very odd artifacts….black lines appearing around all the very high luminance areas of the images. If the image is blown out, at all, in a small area, a black line artifact surrounds the spot. No amount of adjusting exposure after the file is brought into AE will fix the artifacts. If I adjust the exposure prior to bringing the file into AE, the problem disappears.
Anyone know what’s causing this, and how I can avoid it after the file is brought into AE?
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1 Reply
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Thanx for replying Dave. I’m bringing the footage into a 16-bit project from AVCHD formated files acquired from a Sony FS100, altho’ the same happens with footage from an EX1. The files were transcoded to DNx175x (This is Avid’s 10-bit 175Nbps codec) prior to importing to AEFX.
I’m running Win7SP1 64 bit Pro on an HP 8740w laptop with external storage and a quadro fx3800 video card.I can playback to footage on WMP, Media Player Classic, or even import it into AEFX as an 8-bit composition without experiencing the problem. It seems to happen only when I try to bring the footage into a 16 bit comp.I intend to send the output to DNx175x for import into Media Composer 5.5.
I attempted to correct the exposure values with several of AFX’s plugins, including the levels control, synthetic aperture, or even Colorista II.
edit: I’ve imported the native AVCHD files into a 16 bit AEFX comp and have not expereinced the artifacts. So, it seems the problem is related to the trancoding step.
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