Hue vs

Three curves across the full hue circle. Hue vs Hue turns one color into another, Hue vs Sat makes it more or less saturated, and Hue vs Lum makes it brighter or darker. The capsule in the middle switches between them.

Tap the eyedropper, then the photo, and a point lands on that exact hue with a neutral anchor either side, so only that color moves. Drag the point up or down; drag the anchors in to narrow the range or out to widen it. Plus adds a point, minus removes the selected one, and a double-tap resets it. The lock button steps through free, horizontal only and vertical only, for fine moves.

HSL works in eight wide bands and protects skin. This does neither – it moves exactly what you point at, as narrowly as you like. Use it for the specific fix: the one green that reads yellow, the cyan in a sky that should be blue.

The percentage button holds Strength for the tool and each curve, and Hue Smoothing, which reads the hue over a few pixels so noisy areas don’t speckle.