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R
Rocketbottle
Inspiring
May 29, 2022
Question

overbright values clipping in 32-bit

  • May 29, 2022
  • 1 reply
  • 746 views

Hi all.

 

Never found any advice or ideas on how to correct the following problem:

Compositing Arri LogC3 and rec709 sources in 32-bit ACES color space (project color management on).

Overbright white gets clipped to negative when added another overlapping bright source. Both in Screen and Add modes. In the example image, a muzzle flash and sparks are composited together in Screen mode over a log background. The bright values in the layer above turn negative. Hate this.

 

Am I the only one? Please don't suggest OCIO workflows - too complex and slow.

 

This topic has been closed for replies.

1 reply

J
Community Manager
jason_bartellCommunity Manager
Community Manager
June 3, 2022

Hi @Rocketbottle,

 

The Screen blending mode can go negative with over-range, but Add should not. Add should do as the name suggests and sum the individual RGB values. If you post a sample project, which could be just a single frame with a couple of layers demonstrating the issue, we can dig deeper.

 

Cheers,

Jason

    R
    RocketbottleAuthor
    Inspiring
    October 3, 2022

    Thanks for the tip.

    The problem was Trapcode Particular that had internal blend mode as "screen". That was ruining my pipeline. Now I know where to look if problem arises.

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