Light, colour and detail

Two panels hold what most photos need: Light for how bright and how contrasty, Colour for how warm, how vivid, and how sharp.

Light

Control	What it does
Auto	Light and contrast in one click; change anything after.
Levels	The photo's histogram, with three handles: drag the black one to where the darkest tones begin, the white one to where the lightest end, the middle one to make the middle tones lighter or darker.
Exposure	The whole photo lighter or darker, as a longer or shorter shot would be.
Contrast	Darks darker and lights lighter, or the other way.
Highlights, Shadows	Only the bright parts — a sky — or only the dark ones — a face against the light.
Whites, Blacks	Where white and black begin: the last touch for punch.
Curve	The tones as a line, for all channels or red, green, blue alone: click the line to add a point and drag it; a double click on a point, or dragging it out, takes it off; a double click on nothing straightens the curve.
Vignette	The corners darker or lighter: amount and size.

Each slider shows its value; a double click sets it back to 0. Reset at the panel's top puts all of Light back.

Colour

Control	What it does
Temperature, Tint	White balance: warmer or cooler, greener or more magenta.
Click something grey	Then click on the photo something that should be grey or white — a wall, a cloud: the colour cast is gone. As shot goes back to the camera's.
Saturation	Every colour stronger or weaker; all the way down is black and white.
Vibrance	The dull colours stronger and the strong ones much less, so nothing turns garish.
Mixer	One colour at a time — reds, oranges, yellows, greens, aquas, blues, purples, magentas — its hue, saturation and lightness: a bluer sky, greener grass, without touching the rest. Greys and whites are left as they are.
Sharpen, Blur	Edges crisper, or softer.
Less noise	Takes off the colour speckles of a photo at night or at a high ISO — a simple one, without AI: speckles, not miracles.
Grain	Film-like grain.