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Exporting TIF sequence
Hi all. I’m sure that this issue had been discussed here before. However, here I am asking anyways because I couldn’t find it through search.
I received projects with tiff sequence. We made some adjustments and tried to export as tif sequence. However, when I exported using “using quicktime conversion,” it seemed there was problem.
Original tiff files I received are around 11M size. But what I got with “using quicktime conversion > image sequence > Tiff > best depth/none” is only 5M. So I guess there’s a significant amount of quality loss.
When you want to export as image sequence, “using quicktime conversion” is not the correct way then?
If so, what would be the correct way?
Can anyone help on this? -
3 Replies
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A few things. First, my understanding is that Quicktime can only process RGB at 8-bit. I don’t fully understand the situation for this, but I know it’s the reason why AJA and Blackmagic have to provide their own RGB 4:4:4 codecs. So that could be the problem right there. Also, perhaps your original TIFFs had an alpha channel.
Sean
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Don’t export as Best depth. Set “Millions” or “Millions+” if there is Alpha channel.
Rafael -
The TIFFs you received were 16bpc (16 Bits per Channel) at 11MB/frame
The TIFFs you exported were 8bpc at around 6MB/frame
8bit tiff are Millions of Colours (or Millions + if you include Alpha)
16bit TIFF are Trillions of Colours.
Video is 10bit. If you export at Millions of Colours (8 bit) you will loose some information. You were right to try to export at 16 bit.
Here’s how I managed it:
1) Create a Quicktime Reference of the sequence. This should retain the 10bit video colour levels.
2) Import QT Reference into After Effects. Make sure you intrept the footage and tell After Effects it’s HD R709 colour space (basically 10bit video)
3) Make a composition the same size and length as sequence and drop it in.
4) Make composition a 16bpc composition with HD R709 colour space.
5) Add to render queue and export as TIFF, 16 Bit, Trillions of Colours. From my vague memory you can embed the HD R 709 colour management into this using a tick box somewhere.
Hope this helps.
Simon Kotowicz
http://www.onlineeditor.co.uk
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