Colour: Hue, Value and Saturation

When you say colour, you usually mean hue - the family a colour belongs to: red, blue, green, yellow. Hue is the name on the paint tin, the word you say out loud. But hue alone tells you almost nothing about how a colour will behave on a wall.

Every colour also has a value - how light or dark it is, from near-white to near-black, completely independent of its hue. A pale sky blue and a pale buttery yellow are different hues but similar values; navy and a deep forest green are different hues but again similar values. Squint at any photograph of a room and the hues fade away, leaving only the pattern of lights and darks. That pattern is value, and it is doing most of the work.

And every colour has a saturation (also called chroma or intensity) - how pure or how greyed it is. A vivid pure red and a dusty greyed rose share the same hue, but one shouts and one whispers. Pull saturation all the way out and every hue collapses to grey.

Three dials. Turn one without touching the others, and the colour transforms. This is the single most useful idea in this lesson, and the colour-explorer interactive lets you feel it directly.

Here is the part most people never hear: in a room, value usually matters more than hue. Value contrast is what creates the sense of light, depth and three-dimensional form. It is what makes a dark sofa read against a pale wall, a white cornice float above a coloured ceiling, a framed print sit forward from the plaster behind it.

Get the values right and a scheme will work in almost any hue - blues, greens, ochres, it hardly matters. Get the values wrong - everything clustered at the same mid-tone - and even the loveliest hue turns flat and muddy, the kind of room you walk into and cannot say why it feels heavy.

This is why the most reliable way to test a palette is to remove hue from the equation. Photograph your swatches and convert the image to greyscale, or simply sort your objects, cushions and tiles by how light or dark they are rather than by colour family. If the lights, mids and darks are clearly spread out in grey, the room will have life. If they all blur together, no hue will save it.

Arrange the hues in a ring - red flowing to orange to yellow to green to blue to violet and back - and you have the colour wheel, the oldest map in design. Its value is not decoration; it tells you which hues are relatives and which are opposites, and from that you can build the classic schemes.

A monochromatic scheme uses one hue and varies only value and saturation - think a room built entirely from terracotta, from the palest sand-washed plaster to a deep burnt clay. Quiet, sophisticated, hard to get wrong. An analogous scheme uses neighbours on the wheel - ochre, mustard and warm green - so the colours hum together like notes in a chord. A complementary scheme uses opposites - blue against orange, the indigo-and-marigold pairing you see across Indian textiles - high energy, vivid, used in small doses. A triadic scheme picks three hues evenly spaced around the wheel, balanced but lively.

Notice that none of these schemes tells you anything about value or saturation - you still set those yourself. The wheel chooses your hue relationships; you must still make the values sing.

Once you have your hues and values, you have to decide how much of each to use - and a room with every colour in equal measure looks restless. A simple, forgiving guide is the 60-30-10 split.

Roughly 60% of the room is your dominant colour - usually the quietest, often the walls and large surfaces, frequently a warm white or a soft neutral. About 30% is your secondary colour - upholstery, curtains, a rug, a feature wall - enough to give the room its character. The last 10% is your accent - cushions, art, a vase, brassware, a single bold chair - the spark that makes you look twice.

The percentages are not sacred; they are a starting reflex. What they encode is a hierarchy: one colour leads, one supports, one punctuates. The fastest way to learn this is to find a room you love - in a magazine, a friend's home, a hotel lobby - and work out its dominant, secondary and accent. You will see the 60-30-10 logic almost every time.

Colour is not fixed; it is whatever the light makes of it. And Indian light is ferocious. A midday sun in the plains can hit well over a lakh lux, and it does two cruel things at once: it bleaches pale pastels until they look thin and chalky, and it supercharges saturated hues until they glow. The dusty pink that looked refined in the shop can vanish into white by noon; the deep emerald that seemed risky can come alive.

This is why our oldest colour traditions lean into depth, not pallor - the indigo, madder-red, marigold and turmeric of textiles, the saffron and deep green of festivals, the terracotta and ochre of village walls. Saturated, earthy, jewel-toned colours hold their own against strong sun in a way timid pastels cannot.

It is also why warm whites beat cool whites in most Indian rooms. A blue-tinted cool white can read clinical and grey under our warm-tinted daylight; a warm white with a whisper of yellow or pink stays soft and inviting. Temperature also changes how a room feels: warm hues (reds, ochres, terracottas) advance and make a large room feel cosy and enclosed; cool hues (blues, greens) recede and make a small room feel larger and calmer. Never, ever trust a swatch under the shop's tubelight - tape it to your own wall and look in the morning AND the evening.