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Difference Between Primatte RT and dvmatte prp
Having a bit of confusion finishing up a AE junk matte in Final Cut Pro.
I created a tight junk matte on a green screened speaker with AE and keylight.
I can then bring that in to FCPro and manipulate it anyway I want. The speaker appears keyed over my background with a small aura of green screen around him to finish off.
I ultimately want to use dvmatte pro to create the final chroma key; however, anytime I use it, the “green” aura is keyed out properly, but it also creates a black image where my alpha channel is. This creates a black matted bakcground around my keyed out subject.
When I use Primate RT no black matte is created and the “green” aura around my subject is keyed out like it should be. Although it’s not nearly as clean a key as dvmatte pro can do; hence the necessity of using dvmatte pro to finish the key.
I have tried to change the alpha channel within FCPro to no avail. (ie- “none/ignore, straight, black, white). I have also used this in conjunction with the toggle for “reversing alpha”, again my image either has the black matted background or the entire image disappears.
I have even tried to go back to AE and re-render using Premultiplied and Straight Alpha channels and there is still no difference. However, I do notice that FCPro will not recognize the “premultiplied” alpha. Any alpha channeled key I bring in the “alpha” comes in as straight.
I am working with Apple ProRes 4444 video. All AE settings seem to be correct. My sequence in FCPro is also Apple ProRes 4444 to help stay consistent with the key.
I am also using FCPro 7, and AE CS4 w/keylight 1.2
Can someone please help out. Again, I may be missing a step and/or by not knowing the difference between Primatte RT and dvmatte pro, I’m using a step that may be unnecessary.
Thanks,
John V. Pappalardo
Head Editor
Cinipix, Inc. LLC -
2 Replies
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Have you rendered? i have noticed with ProRes 4×4 that you have to render in order to see the alpha displayed properly when compositing.
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[John V Pappalardo] “I ultimately want to use dvmatte pro to create the final chroma key; however, anytime I use it, the “green” aura is keyed out properly, but it also creates a black image where my alpha channel is. This creates a black matted bakcground around my keyed out subject. “
I believe that when using DVMatte Pro, you need to put the background clip into one of the image wells in the filter controls (in the viewer window) rather than on V1 of the timeline. In other words, you apply the filter to the front clip, then add the background clip in the filter controls rather than by stacking a front and back clip on V1 and V2 in the timeline. It’s an odd workflow, but that’s just the way they designed it.
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