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AE graphics with alphas into FCP4.5-not clean
I’m wondering if anyone else is unhappy with the quality of the alpha channels, or if there’s a trick to getting nice clean ones. We get black edges around ours. These are graphics rendered from AE 6.5 as Animation (tried both straight and premultiplied alphas), then imported into FCP 4.5 using Uncompressed 8bit or 10bit sequence settings (looks the same on both). Field dominance is Upper (PAL). Looks great in AE, but the edges of the alpha are not clean in FCP.
We’re thinking it’s to do with FCP only being able to do ‘straight’ alphas?we are working in PAL, 720×576, Blackmagic decklink extreme
OSX 10.3.5, QT 6.5.2Any help or observations would be fantastic
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4 Replies
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Paula,
Although I am using v5 I used to do this all the time in 4.5 and never had a problem. I always use straight alphas. Check your quality settings coming out of AE.
Have a wonderful day.
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Ditto. We always output from AE using the animation codec and all of the keys are as clean as could be. Double check everything again.
Tom -
AE defaults to premultiplied black on it’s builds with alpha. FCP always looks for the straight key signal as a default. This can be fixed on either end with the correct settings. FCP has the settings for alpha key under Modify>Alpha Type. There are options for None/Ignore, Straight, Black, White. Depending upon what the background of your key is use the approriate one.
You may also be creating some issues in Photoshop and how AE recognizes the key. If you are importing graphics always know your background and how your key signal is derived.Kurt Reitz
EGT Communications -
thanks all, we’re always thorough about settings, but have been doing tests on different machines and it seems the problem is really only on one of the graphics guy’s machines, so it could be preferences or decklink card issue? hmm, will start process of elimination.
tnx again
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