The most precise tool in the room
Color Curves
Curves are where contrast and color get surgical. Bend a line and you remap every tone exactly where you want it — lift the shadows, roll off the highlights, push warmth into the mids — on the master or one channel at a time.
What it is
A curve maps input tones to output tones. Drag a point up and those tones get brighter; pull it down and they darken. The Master curve shapes contrast; the Red, Green, and Blue curves push color into specific tonal regions.
It's the most precise tonal tool you have — every other contrast or color-balance move is, under the hood, a curve.
The controls
Master / Luma
Shapes overall contrast and brightness without shifting color. The classic S-curve lives here.
Red / Green / Blue
A curve per channel. Lift the blue curve's shadows for cool blacks, drop its highlights for warm whites — this is how split-toning is built.
Add & drag points
Click to add a control point, drag to taste. More points mean more local control; fewer mean smoother, more natural transitions.
What to do with it
Where Color Match earns its place in a real grade.
Add contrast that flatters
A gentle S — lift the highlights, drop the shadows — adds punch while keeping mids natural.
Fade the blacks for film
Raise the bottom-left point off the floor and your shadows go milky and cinematic.
Split-tone the image
Cool the shadows and warm the highlights with the R/G/B curves — the foundation of the teal-and-orange look.
Fix a cast in one tone only
Magenta creeping into the shadows? Nudge just the shadow end of the green curve and leave the rest alone.
Field tips
- Keep an anchor point in the mids so a contrast move doesn't drag your skin tones around with it.
- Small moves. Curves are powerful enough that a few pixels of drag is a real change.
The science
The part nobody else explains
A curve is a transfer function
The horizontal axis is the tone you have, the vertical is the tone you get. The default 45° line changes nothing; bend it and you've defined exactly how every input value maps to an output.
Slope is contrast
Wherever the curve is steeper than 45°, you're stretching those tones apart — more contrast. Wherever it's flatter, you're compressing them — less. An S-curve is just 'steepen the mids, flatten the extremes.'
Per-channel curves are color, by tone
Move the blue channel's shadow point and you've added blue to the darks only. Because you can target color by tonal region, channel curves do what a single white-balance move can't — different color in shadows than in highlights.
Why curves beat sliders
A brightness slider shifts everything; a contrast slider pivots around the middle. A curve lets you decide, per tone, exactly what happens — which is why it's the tool every other one approximates.
Frequently asked
Curves vs levels — what's the difference?
Levels set black, white, and a single midpoint; curves let you place as many points as you want, anywhere. Curves are levels with unlimited control.
How do I make an S-curve?
On the Master curve, pull a point in the highlights up a touch and a point in the shadows down a touch, keeping the middle anchored. That's contrast that respects your mids.
RGB curves or HSL for color?
Curves shift color by tonal region (shadows/mids/highlights); HSL shifts it by hue. Use curves for tonal color balance, HSL to target a specific color.
Related features
Try Color Curves on your own shot
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