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PNG Sequence with Pre-Multiplied Alpha

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Stephen Botting
PNG Sequence with Pre-Multiplied Alpha
on Jul 7, 2016 at 12:01:09 am

Hi There,

I don't seem to be able to render PNG Sequences with pre-multiplied Alpha.

AE CC 2015

I just discovered that's why I can't get my alpha channels to look right.

Any ideas?

Cheers,
Stephen

http://www.43south.co.nz


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Walter Soyka
Re: PNG Sequence with Pre-Multiplied Alpha
on Jul 7, 2016 at 12:51:21 am

[Stephen Botting] "I don't seem to be able to render PNG Sequences with pre-multiplied Alpha."

Premultiplication violates the PNG spec [link]. PNG alpha is always supposed to be straight.

What is the problem you're having? Can you show the issue and describe your workflow?

Walter Soyka
Designer & Mad Scientist at Keen Live [link]
Motion Graphics, Widescreen Events, Presentation Design, and Consulting
@keenlive [twitter]   |   RenderBreak [blog]   |   Profile [LinkedIn]


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Stephen Botting
Re: PNG Sequence with Pre-Multiplied Alpha
on Jul 11, 2016 at 2:57:00 am

[Walter Soyka] "
Premultiplication violates the PNG spec [link]. PNG alpha is always supposed to be straight.

What is the problem you're having? Can you show the issue and describe your workflow?
"


I wasn't aware of that, thanks. I've done a little digging and it appears the Blackmagic ATEM doesn't interpret PNG's correctly. Looks like I'll be switching to targa, for the ATEM. I thought I was having problems with CasparCG, but that has turned about to be ok.

Thanks for your help.

Cheers,
Stephen

http://www.43south.co.nz


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