Here's the uncomfortable truth atelier teachers repeat until students believe it: value does 80% of the work in a painting; colour does 20%. Get the darks and lights right and viewers will forgive almost any colour choice. Get them wrong and no amount of beautiful colour will save the picture. Yet most beginners spend all their attention on colour. This guide is about the other 80%.
Walk through any life-painting studio and you'll see artists squinting at the model like they've lost their glasses. Squinting blurs vision, which strips away detail and colour and leaves only the pattern of light against dark — exactly the information a painter needs first. It answers the two questions that matter before any brush touches canvas: where are my big dark shapes, and where are my big light shapes?
The most common beginner value error is letting the light family and shadow family blur together — a halftone painted too dark, a shadow accent too light, until the painting has no structure, just fifty scattered values. The fix is value grouping: sort everything into no more than 3–5 values, and keep every shadow value darker than every lit value. If you can hold that separation, the painting will read from across the room.
Notan is the Japanese design concept of reducing an image to pure dark and light — just two values, no middle ground. It's brutal and revealing: if your composition doesn't make a strong abstract pattern in two values, it won't make a strong painting in twenty. Do the notan check before committing to a composition, not after.
Squinting at a phone screen only goes so far — and photos themselves lie about values (shadows crush to black, highlights blow to white). This is exactly what Squint Lab was built around. Load your reference and drag the blur slider: it's a squint you can control, calibrate and hold. Switch to grisaille to strip colour entirely, set value steps to 2 for an instant notan, or 3–5 to see your value groups as flat, paintable shapes. When the values are settled, its colour-mass mode maps out what to mix — colour matching comes after, exactly as it should.
Squint at your reference properly — free, no signup