on 11/22/02 3:48, Arno Bosse at email@hidden wrote:
> I don't know, I find this 'feature' more annoying than useful. First, if you
> open several movies in QT player, only the first (topmost if I remember
> right) adjusts its gamma. Second, if you are using MIAMs (movie in movie) in
> a custom movie, having just your mp4 content appear with a differently
> shaded white background is disconcerting. Finally, if you have already
> adjusted the gamma of your display (in my case, on a powerbook, to 6500K and
> 2.2) and then have your mp4 movie 'correct' this again, is also not a good
> thing.
>
> Perhaps these are special cases - if I had a way to turn this feature off or
> control its operation it wouldn't be so bad. But, AFAIK, you can't even do
> this with a tool like LiveStagePro.
You might try changing the mode for how the codec draws to the screen.
By forcing it not to use the YUV overlay, the gamma correction would
probably go off (and you'd get a substantial performance penalty, alas).
> Just out of interest, how does the codec determine what gamma you've
> currently got? Through colorsync (but it might be turned off, PCs don't use
> it) or in the assumption that Macs are 1.8 and PCs 2.2? That's not a good
> assumption, ironically, especially so for those people who care about
> calibration.
It assumes Macs are 1.8 and PCs are 2.5. It ignores ColorSync settings
entirely. I agree this is sub optimal, especially for Macs. Since DV and
other codecs also use this feature, this means that video content authors
pretty much need to work in 1.8 on Macs, when many of them have been using
2.2 for years.
Ben Waggoner <http://www.benwaggoner.com>
Compressed Video Consulting, Training, and Encoding
My Book: http://www.benwaggoner.com/books.htm
Cleaner Tutorial: http://www.saferseas.com/navseries/adclean.html
Compression Books: http://www.benwaggoner.com/bookshelf.htm
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