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Problem Freeze Frames with Alphas
Using a Kona LHe on quad, 10.4.8 and FCP 5.1.2
When performing a freeze frame on a graphic (created in AE 7.0) that has alpha attached, the opacity of the alpha
changes when frozen. There is a 3-5% shift in luminance between the original graphic and the freeze frame of the graphic.
I assumed this to be a AE related setting but I get no such problem whilst doing the same edit, with the same file
on a similar system with a Decklink extreme. Is there a set up I’m missing for the Kona??Any help appreciated
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6 Replies
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Are you making the freeze frame within FCP?
How are you making it?
Have you tried exporting a still?
Can you make the freeze frame in AE?
Is the alpha interpreted correctly within FCP (straight or black)?
Jeremy
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Jeremy
Freeze is created in FCP with ‘Make Freeze frame’
The alpha is set to straight.
I can make the freeze in AE
but I do a fair amount of these graphic items and they need a 10sec hold and
rendering out takes a fair while longer in AE.Thanks
Neil -
Export a still from AE with an alpha. Much better quality.
Jeremy
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Thanks.
Doesn’t explain why I have no problems with freezes using the Decklink card though.
Any theories?? -
I think decklinks and aja cards handle gamma differently. AJA is WYSIWYG and Decklinks try and compensate.
That’s my theory.
Jeremy
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I have found the solution. Working in 8 bit, my video processing
was selected to be ‘Render in 8 bit YUV’ which seems sensible.The problem with the freeze frames disappears when I select
‘Render all YUV material in high precision YUV’
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