overbright values clipping in 32-bit

[Rocketbottle]

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.

[jason_bartell]

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

[Rocketbottle]

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.