Tools

Color

In the app, every tool's ⋯ menu ▸ Help opens its section here; hover any slider for a short explanation.

Calibration

Moves the red, green and blue primaries (hue and saturation), like a camera calibration.

Change hue, saturation and lightness of colour bands, freely picked colour ranges or skin tones.

Parameter	What it does
Smoothness	Width of the soft edge around the selected colour range, in degrees of hue.
Range	Width of the fully selected colour range, in degrees of hue.
Hue	Shifts the hue of the selected colours (±30°).
Saturation	More or less saturation for the selected colours.
Lightness	Brighter or darker selected colours.

Basic: eight colour bands plus All colours.
Advanced: pick a colour with the eyedropper or drag on the wheel; each range has its own width, soft edge and ΔH / ΔS / ΔL.
Skin Tone: pick the skin colour; Amount shifts it, Uniformity evens skin out.
View selected color range shows the selection with everything else grey.

Tint shadows, midtones and highlights with colour wheels, plus their brightness.

3-Way shows shadow, midtone and highlight wheels; drag the puck to tint, double-click to reset.

Global hue rotation and saturation, and saturation by tone zone.

Parameter	What it does
Hue rotation	Rotates every hue around the colour wheel.
Saturation	Colour intensity: lower is more muted, higher more vivid.

Black & white conversion with per-colour sensitivity, like coloured filters on film.

Each colour slider makes that colour lighter or darker in the monochrome image, like a coloured filter.

Separate colour tints for shadows and highlights.

Parameter	What it does
Shadow hue	Colour of the shadow tint.
Highlight hue	Colour of the highlight tint.
Balance	Moves the split between shadow and highlight tint.

Photoshop-style selective colour: add or remove cyan, magenta, yellow and black in a colour range.

Parameter	What it does
Cyan	Adds (+) or removes (−) cyan ink in the chosen colour range: less red light.
Magenta	Adds (+) or removes (−) magenta ink: less green light.
Yellow	Adds (+) or removes (−) yellow ink: less blue light.
Black	Adds (+) or removes (−) black ink: darker or lighter.

Pulls colours that fall outside the output gamut smoothly back in, avoiding hard clipping.

Parameter	What it does
Threshold	Saturation from which colours start to be compressed.
Limit	How far outside the gamut colours are brought back from.