Qualifiers

A qualifier isolates pixels by color/luminance characteristics so a node can affect a controlled region instead of the entire image. Oraphim's Color qualifier modes include HSL, RGB, and Luma.

Visual reference

Use the viewer and scopes together when refining a key; a clean matte is more important than extreme control values.

Build a clean key

1. Select the Color node that should own the secondary correction.
2. Choose the qualifier mode that matches the problem.
3. Sample or adjust the key while viewing the matte/highlight view.
4. Refine the selection until the subject is included without unnecessary background contamination.
5. Add the correction only after the matte is stable.

A qualifier is not guaranteed to isolate an object by itself. Similar colors elsewhere in the frame can enter the key, and motion/lighting changes can alter the selection over time.

Combine with windows

Use a power window to restrict where a qualifier may operate. This is often more robust than trying to make the color key impossibly narrow. Track the window when the subject moves.

Verify

Inspect the matte at multiple frames, especially motion blur, shadows, highlights, edges, and frames with lighting changes. Toggle the correction and check that unaffected regions remain visually stable. Render a short sequence to catch temporal chatter that a still frame can hide.

Qualifier example

To adjust only a saturated jacket, sample the target color, inspect the resulting key, then refine hue/saturation/luminance ranges until the subject is isolated without chattering edges. Add softness or cleanup before making a strong grade. If similarly colored background areas are still selected, combine the qualifier with a window. The quality of the matte should be judged before the beauty of the correction.