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Black/White Fringe on scaling an image with straight alpha
Posted: 17 Feb 2013, 15:11
by Caveman
Hi, I have just noticed that all my renders that has straight alpha gets either a black or a white fringe when I scale up or down the image in After Effects. This never happened in Softimage Illusion.
Please check the attached image.
Re: Black/White Fringe on scaling an image with straight alpha
Posted: 17 Feb 2013, 15:54
by clyder
Caveman wrote:Hi, I have just noticed that all my renders that has straight alpha gets either a black or a white fringe when I scale up or down the image in After Effects. This never happened in Softimage Illusion.
Please check the attached image.
Looks fine here in AE CS6.
Are you sure you interpreted the footage as straight in After Effects?
Re: Black/White Fringe on scaling an image with straight alpha
Posted: 17 Feb 2013, 16:20
by Caveman
Hi, did you scale the image and also did you set the color depth to 32 bit in the Project Settings?
Yes I have set the alpha to straight - unmatted.
Re: Black/White Fringe on scaling an image with straight alpha
Posted: 17 Feb 2013, 20:44
by clyder
Caveman wrote:Hi, did you scale the image and also did you set the color depth to 32 bit in the Project Settings?
Yes I have set the alpha to straight - unmatted.
Yeah, you are right.
In 32bit it has a black stroke around the edges. Can you share your render settings from Softimage?
I just imported some exr from one of my projects into AE to test and there is no such issues with scaling and 32bit project.
But I havent rendered those as straight images.
Re: Black/White Fringe on scaling an image with straight alpha
Posted: 18 Feb 2013, 03:35
by Caveman
Hi in Softimage I just unchecked Premultiply with Alpha Channel (in the Framebuffer Tab). With Premultiplied Renders I don't get the fringe.