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Bit confused about bits 8, 10 , 16 etc
Just trying to get an understanding of workflow with my decklink extreme board – for things like creating titles and boards in photoshop, should my psd project be set to 8 bit or 16 bit? Likewise for AE…Im assuming for best composititng I should be working in 16 bit mode BUT how does this relate to the decklink 10bit workflow? ie in Premiere, using a 10bit project – how does this work importing 16bit psd files or using the dynamic link to bring across a 16bit after effects composition?
Any help would be greatly appreciated
Pablo
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6 Replies
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Long story trying to be short… in order to preserve a 10bit pipeline you need to work in bit depths 10bit or higher. Most computer applications do not support 10bit, since computers like multiple of 8’s. Therefor you must work in 16bit or higher in apps like After Effects or Photoshop whenever you want to preserve the detail in 10bit material (ie. Digibeta, D5, HDCAMSR, etc.), create original material with subtle gradients, or get your best bang for the buck when pulling keys or color correcting. If you are creating flat graphics without gradients there is not a need to jump up to 16bit, and everything will work and render faster.
You need to do a few things to get After Effects to work. Make sure your project is set to 16bit. Make sure that Trillions of colors is selected in the Output Module popup. On the Mac this is not on by default, and the text prefs must be modified. Open the text prefs and scroll down to QuickTime 64bit, and set v210 to “1”. Then you should be able to access “Trillions”. If this popup is not active, you will render 8bit RGB into your 10bit YUV file.
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Just to add on. You don’t have to do this when using After Effects 6.5 if you’ve installed the Blackmagic drivers (after installing After Effects 6.5) as we modify the pref files for you. This does not happen with After Effects 7.0 as yet but we will do so in in subsequent driver updates
regards
Kristian Lam
Blackmagic Design -
Brilliant – Clear as a Bel now thanks!
Pablo
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Matt,
How or where do you find this text file to edit?
“You need to do a few things to get After Effects to work. Make sure your project is set to 16bit. Make sure that Trillions of colors is selected in the Output Module popup. On the Mac this is not on by default, and the text prefs must be modified. Open the text prefs and scroll down to QuickTime 64bit, and set v210 to “1”. Then you should be able to access “Trillions”. If this popup is not active, you will render 8bit RGB into your 10bit YUV file.”
Warren
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Warren Eig
http://www.babyboompictures.com
O 310-470-0905 -
Hi,
I was going to post a similar question but this thread is perfect. I have offlined an NTSC BetaSP project using the DV codec to save space. Now when it comes time to up resolution I was planning on using the BM 8bit codec as that is what BetaSP is, 8 bit YUV 4:2:2. But from working the offline cut, I know that I will have to export several clips back to AE (7.0) again for stabilization once I recapture at the higher resolution. There are also quite a few color timing problems. Does it make any sense / difference to select these particular clips for 10 bit capture to help with the back & forth with After Effects, that is in terms of quality loss, etc? Is 8 bit adequate or should I capture everything @ 10 bit? I’d rather not, because I think I might be pushing the abilitiy of my two drive SATA raid ( BM speed tested at around 125 read/write).
Thank you,
peter
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well, if the analog-to-digital converter quantizes with more
than 8-Bit (AJA and BMD use 10, 12, or 14-Bit converters)
than you could keep more of information in a 10-Bit codec
than with 8-Bit.However it depends your footage and because of the video
noise you won’t have similar colour values like in a gradient
created in a graphic application like Photoshop … in 99,99%
of all cases you’re fine in 8-Bit …
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