Black clipping occurs when using blur effects with GPU rendering
Issue:
When using Mercury Playback Engine GPU Acceleration (CUDA), applying blur effects such as Gaussian Blur or Directional Blur causes black clipping in dark areas, resulting in loss of shadow detail. This problem does not occur when using the Mercury Playback Engine Software Only mode.
Steps to reproduce:
Place a clip with shadows or grayscale gradients in the timeline
Apply a blur effect with GPU rendering enabled
Preview or export shows clipped shadows
Request:
Improve GPU rendering precision so that tonal range matches software rendering results
Reintroduce the "Mercury Playback Engine Software Only" option removed in v25.2+, to allow users to bypass GPU rendering when necessary for quality reasons.
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