RemoveNoise

The Resolve 21 manual describes blurring the channels, comparing the softened image with the source to identify noise, and adding sharpness while avoiding detected noise. The practical order is to reduce visible grain with Softness, then raise Detail until useful structure returns, stopping before grain comes back.

Method=Color provides separate Softness Red/Green/Blue and Detail Red/Green/Blue. Do not pick a channel by a rule such as “always Blue”: inspect every channel of the same frame and find the actual contamination. Lock links corresponding sliders, so disable it for independent adjustment.

Method=Chroma changes the controls to Softness Luma, Softness Chroma, Detail Luma and Detail Chroma. These are not the RGB controls under different names. To start with chrominance, disable Lock and leave both Luma controls at zero; check that useful color detail does not disappear along with blotches.

The black part of Effect Mask retains the original result, white permits processing, and gray gives a transition. The manual describes the mask as applied after the effect is processed: it does not guarantee faster filtering or redefine the neighborhood used for pixel analysis.

Denoising before a keyer can improve source chrominance, but does not replace matte adjustment or guarantee stable alpha. Compare hair, translucent boundaries, gradients and consecutive frames; retaining luminance grain can be an intentional result of Chroma-only processing.

Exercise numbers are moderate comparison starting points, not universal presets. The archive shows Color with zeroed controls; missing Chroma controls were added to the reference from the official manual screenshot. Native filtering quality was not measured here.