Blending mode-transition problem

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sun
Posts: 37
Joined: Mon Mar 24, 2014 10:12 am

Blending mode-transition problem

Post by sun »

Hello, i like to work with the combiation of the effect Gradient (radial) and the blending mode Multiply. It leads to a really nice mood. Only one thing i really dont like: One see the transition from bright to dark:

Image
Image

See! There are dozens of little circles. They are there beforeand after rendering. And they become more obvious when i reduce the size of the film/ choose a lower quality. They look like texture that the artist didnt want to aim.

Does anyone know how to achieve a better/ a smoother tranistion?

I tried to in increase the blur rate of the blending layer but i didnt help.

Thank U for IDEAS :idea:
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slowtiger
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Re: Blending mode-transition problem

Post by slowtiger »

This kind of artifact is called "banding" and exists since the very first pixel image.

See viewtopic.php?f=5&t=23450 for the technical details.
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sun
Posts: 37
Joined: Mon Mar 24, 2014 10:12 am

Re: Blending mode-transition problem

Post by sun »

Thank U for the answer. I red the link, the discussion bout Limited Codecs in Mac OS. Is it right: There s no really formula againts this problem. Photoshop could help. It would reduce the effect but wouldn t remove it. But your advice: avoid gradient effects?
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slowtiger
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Re: Blending mode-transition problem

Post by slowtiger »

Avoid small gradients (not much colour value change) over a long distance when they don't move much.

Other than that: use textures to mask gradient banding. Or re-evaluate your style. That's why I paint my BGs now.
AS 9.5 MacPro Quadcore 3GHz 16GB OS 10.6.8 Quicktime 7.6.6
AS 11 MacPro 12core 3GHz 32GB OS 10.11 Quicktime 10.7.3
Moho 13.5 iMac Quadcore 2,9GHz 16GB OS 10.15

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sun
Posts: 37
Joined: Mon Mar 24, 2014 10:12 am

Re: Blending mode-transition problem

Post by sun »

hello, maybe to paint the gradients seems to be the best solution. Nice idea. Thank You
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