---In Avid-L2@yahoogroups.com, <bouke@...> wrote :
"- ProRes is always at least 10 bit. Even the proxy one."
That is very important information. I was not aware ProRes is always 10bit. Just to state the obvious here when I force all my renders to ProResHQ that would assure the rendered media is at least 10 bit given this new information.
Also as Dave pointed out the DNxHRHQX codec is listed at 12 bit in Avid documentation. Logic would then dictate that if I set Media Creations to render to DNxHRHQX all the renders would be 12 bit. This would assume that all the efffects processing etc... would be working in 12 bit.
I seem to recall reading from time to time concerns that certain parts of the effects food chain may only work in 8 bit. I can't recall the specifics that have been mentioned but when working with HQX 12 bit material is it possible certain effects and or symphony style color correction would only work at 10 bit or less?
It's good to be reminded that a gradient with a slow fade out will help see bit depth errors but as has already been pointed out limitations in display hardware can further confuse those assessments. I've recently been told by a fellow online editor that he had seen Avid take his 10 bit material and on certain exports to ProRes his export was only 8 bit. If he did an internal Avid mixdown to ProRes first then exported same as source he said that had resolved his 8 bit problem. Now given my new awareness that all ProRes is at least 10 bit I don't see how this editor was getting 8 bit on his exported file. I assume he was using a custom export to turn avid dnx media to ProRes in the case where he felt the export was 8 bit but I don't know for sure.
Is it possible when using custom export, I know it is best advised to avoid using custom export, that running through the QT engine Avid is reverting to 8 bit processing. I'm just trying to understand what I heard from a fellow editor. When I asked the editor how he knew it was 8 bit he said he could just tell. Given the possibility of the display food chain is what's making something appear 8 bit it seems like the only way to really know what's going on is for someone at Avid to clarify the exact nature of how Avid handles bit depth in it's processing.
---In Avid-L2@yahoogroups.com, <bouke@...> wrote :
van Oldenbarneveltstraat 33
6512 AS NIJMEGEN, the Netherlands
+31 24 3553311
----- Original Message -----From: bigfish@... [Avid-L2]Sent: Sunday, August 28, 2016 5:03 AMSubject: Re: [Avid-L2] When does Avid go into 10 bit mode in 4K renders?You make a valid point. What I'm really concerned about is if timeline quality settings have any effect on 8 vs 10 bit rendering. Normally I will set media creations settings to DNX175X for rendering codec and don't let it be same as souce. However in this 4K project I've set the render to ProResHQ which isn't specific to bit depth. Or is it? My understanding is ProResHQ is 220mbs like DNX220 in 29.97 but that doesn't tell me it's bit depth. If my timeline quality isn't 10bit would a render be ProResHQ 8 bit?
Virus-free. www.avast.com
Posted by: bigfish@pacbell.net
| Reply via web post | • | Reply to sender | • | Reply to group | • | Start a New Topic | • | Messages in this topic (6) |
No comments:
Post a Comment