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Re: Gamma problem with 2vuy compressor / ICM session

Subject: Re: Gamma problem with 2vuy compressor / ICM session
From: "Jan E. Schotsman" <email@hidden>
Date: Thu, 29 Mar 2007 22:19:39 +0200
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On 29-mrt-07, at 21:06, Mark Munte wrote:

Note: I compared the ImageDescriptions that are being generated from
the ICM for 2vuy and yuv2.
The yuv2 compressor generates no image description extensions.
The 2vuy compressor gerenates both a 'colr' and 'gama' image
description extensions. ‘colr‘ is filled with type:nclc, primaries:6,
function:2 (means unknown), matrix:2, ‘gama‘ is filled with 2.2

I believe 'colr' takes precedence over 'gama', but if "function" is unknown then probably nclc defaults to 2.2 or maybe QT is smart enought to use 'gama' instead. Probably doesn't solve your problem :-( Have you tried deleting the 'colr' extension just to see how the video looks when 'gama' prevails??

Jan E.

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