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High Precision YUV & Colorista…a problem??
I have Stu’s book “DV REBEL GUIDE” and he advocates using “high precision yuv” in FCP when working with yuv codecs of course.
Well, DVCPRO-HD is YUV last time I checked.
I did some contrast adjustment on a shot, bringing the whites down to 95% in fcp scopes and the blacks down to zero without crushing, looks great on my broadcast monitor.
so I export the clip and re-import it and examine with scopes to see if it held….it didn’t, it was over 100% white not quite as bad as it was but well over nonetheless.
I tried the superwhite setting for whites and that didn’t change anything.
What did finally make the colorista settings retain in the exported clip was to change the “high precision yuv” setting in my sequence to 8-bit only. I thought there was an advantage to the high precision setting to keep renders nice, is that really only for higher than 8-bit codecs?
Pardon my stupidity if this seems so obvious but the last thing I thought was that it would prevent colorista from doing its job.
Also one other interesting observation for Walter.
I noticed that bringing down the whites to 95% (as you recommend in fcp since a hardware scope will read it as 100%)
then bringing the rendered clip back in, interestingly enough showed as just a hair below 100% on the fcp scopes. -
14 Replies
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DVCPro HD is an 8 bit codec so that’s all the precision you are going to get and perhaps something is getting rounded off wrong.
Have you tried this by putting this in a 10bit or ProRes 422 HQ timeline and trying again?
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I have not.
I understand its an 8-bit codec but I was a little surprised to see that it didn’t at least keep everything legal in high precision like it did with 8-bit rendering.
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I think there’s probably some rounding errors when coming back to 8bit. I’d leave it off if you are going to 8bit as it really does nothing for ya.
I would also trying going to a 10bit timeline, be it UC or ProRes HQ
Jeremy
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I thought High Precision YUV would be helpful, but apparently not, so I’ll stick with 8-bit on DVCPRO-HD projects.
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Just for the heck of it, copy and paste your clips into a 10bit timeline and see what happens.
I’d be curious myself.
Jeremy
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Borgis,
Is as Jeremy says. High precision only works if you set your time-line in 10b.
I have experienced another think. If your time-line is 10b but you don’t set :High precision”, you end up with a 8b movie.
I think that if you ingest DVCProHD, and you export with the same codec, there is not point to set it in “High precisssion”.
BTW, you sayd something about that when starting your Mac, you hold-down the right button and you don’t need to use DiskWarrior or so. Can you explain my that?
Cheers,
rafael -
[Borjis] “I have Stu’s book “DV REBEL GUIDE” and he advocates using “high precision yuv” in FCP when working with yuv codecs of course.
Well, DVCPRO-HD is YUV last time I checked.”
I never use High Precision YUV when working with DVCPro HD. Actually I never use that setting at all as it always seems to cause problems.
Walter Biscardi, Jr.
https://www.biscardicreative.com
HD Editorial & Animation for Broadcast and independent productions.Stop Staring Start Grading with Apple Color The new Color Training DVD now available!
https://store.creativecow.net/p/66/stop_staring_and_start_grading_with_apple_colorRead my blog! https://blogs.creativecow.net/WalterBiscardi
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SOrry to come in late to this, as I use Colorista and DVCPRO HD too.
yeah, I don’t use high precision YUV for DVCPRO HD. I figured this out too the first time I tried what Stu said he does. It didn’t work out, so I didn’t to it. Not everything works for every given situation.
Shane
Littlefrog PostGETTING ORGANIZED WITH FINAL CUT PRO DVD now for sale!
http://www.lfhd.net -
Thanks Guys.
rafalaos, I have all of my 10-bit sequences set to render in 10-bit not high precision YUV and that seems to work ok.
As for starting a mac with a button pressed, I think you might have mistaken me for someone else.
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[Borjis] “I have all of my 10-bit sequences set to render in 10-bit not high precision YUV and that seems to work ok.
You’re right. I just made a test and do not happens. I’ve just installed FCS2. With the 5.x it hapens to me whenever I tried to render 8b footage in a 10b time-line and I forgot to set the “High precission”. I end up with a 8b Unc clip.
With the 10b didn’t happens because FC used to force the “High precision”. Render in 8b was grayed.[Borjis] “As for starting a mac with a button pressed, I think you might have mistaken me for someone else”
Yes, Sorry. Some body posted something about a kind of System optimizing when starting like that. I thought was you.
Cheers,
rafael
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