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gamma shift, ProRes to DVD, remedy?
I’m getting a gamma shift on DVDs. I think this is a ProRes issue, but can’t find posts on it, though I think I saw something awhile back.
Orig. hdv footage, captured, edited in 8 bit ProRes in fcp6. Levels good in fcp and all still looked great after compressor and on import to DVDsp. At the last step, actually making the DVD, a huge shift to washed out, bright.
So, I tried using compressor gamma filter 1.2, but still same problem. I’m now trying again, this time adding filter -2 brightness which looked better with a short test, but don’t know yet what this full length version will look like.
Any tips re: settings or remedies for the gamma shift? Is it ProRes issue or something else. Urgent.
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6 Replies
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Chris,
Are you sure this is a gamma shift, or are you seeing things looking very bright when viewing the DVD on a set top player and TV?
David Roth Weiss
Director/Editor
David Weiss Productions, Inc.
Los AngelesPOST-PRODUCTION WITHOUT THE USUAL INSANITY ™
A forum host of Creative COW’s Apple Final Cut Pro, Business & Marketing, and Indie Film & Documentary forums.
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make a dvd with ntsc bars.
check it out on your tv.
if you can see super black and black in the pluge, there is nothing wrong. Calibrate your tv or monitor to that.
If super black and black are both the same black value
there is a problem. -
OK, I just checked my ntsc monitor (not tv), which I hadn’t calibrated recently.
I put some fcp bars into a sequence and then view on both my cinema display and ntsc which is hooked up to an mxo box.
The pluge bar was a bit bright, so I brought it down, but not as far down as I would have if I were working with less ambient light on my monitor. So I adjusted the pluge now for my daytime viewing, making it barely visible.
Now I played two versions of my DVD on a set top playing out to this ntsc monitor. At least now the first one, without gamma and brightness adjusted in compressor, looks more acceptable.
The 2nd version DVD, with the gamma and brightness adjusted in compressor, also looks acceptable, maybe a bit preferable in some scenes if you creatively like deeper blacks ( I do ).
The lighter one looks really bad on my sony tv. set which I cannot adjust. It also looks really washed out when I viewed it on a sony hdtv at circuit city . . .where i could not adjust the settings.
I’m just bummed how bad mpeg-2 DVD quality looks, after enjoying how good it looks before going to mpeg-2.
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[chris gorman] “The lighter one looks really bad on my sony tv. set which I cannot adjust. It also looks really washed out when I viewed it on a sony hdtv at circuit city . . .where i could not adjust the settings.
I’m just bummed how bad mpeg-2 DVD quality looks, after enjoying how good it looks before going to mpeg-2.”
you should never have to make adjustments to your content during encoding (in compressor) You can, but you should not have to.
the only difference from final cut to dvd should be a slightly softer picture (mpeg encoding). thats it.TV’s at retailers are always set into a torch mode, you would never want to rely on that for picture quality judgement.
If it looks really bad on your sony tv that is not adjustable then you need to find something else that is adjustable to ensure its properly set up.
Cinema monitor cannot be used either, brightness is way too high and contrast really low. No getting around that with todays consumer lcd panels.
I have seen bad composite cables and cheap dvd players output awful images.
be aware that upconverting dvd players usually upconvert very poorly.
When judging sd dvds on hd displays you MUST have a great up converting player or processor. Toshiba hd-dvd players and the playstation 3 are excellent up conversion players. so are the oppo series.
you should be judging only on a calibrated broadcast monitor or tv that you know is set within calibrated specs or else your just guessing.
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I just made a bars/tone DVD and checked both my ntsc monitor and tv.
ntsc is good (see my other recent post re: I adjusted it). My t.v. is a bit bright, eg., the pluge bar is more than just barely visible.
Of course it’s my ntsc monitor I use for production and evaluation, but then I also play it on my consumer set just to see one example of a “worst case scenario”.
Thank you for your prompt and useful help.
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glad to be of help chris 🙂
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