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What contrast should a heat ramp keep so sequential scale stays apart from diverging scale at 8 to 1?

A heat ramp fails when sequential scale and diverging scale sit too close in lightness, even if the hues differ. Aim for about 8 to 1 between text and the ground, and a clear step between neighboring series. The palettes page shows sets built for that, and the studio is where you apply one set instead of picking colors one by one.

At a glance

Lightness before hueTwo series in a heat ramp can share a hue family if their lightness differs.…
Palettes before the canvasOpen palettes, pick a set that already separates sequential scale from…
Grey for the quiet seriesIf the heat ramp has one series that is only context, paint it grey and keep…
Twelve hues is a warning — sequential-vs-diverging-heatA categorical heat ramp that needs more colors than you can name will not…

Pick the palette before you open the studio. For a heat ramp, keep text near 8 to 1 against the ground and keep sequential scale clearly lighter or darker than diverging scale. A rainbow that fails that step will still fail after you add a legend.

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Pick the palette before you open the studio. For a heat ramp, keep text near 8 to 1 against the ground and keep sequential scale clearly lighter or darker than diverging scale. A rainbow that fails that step will still fail after you add a legend.

Lightness before hue

Two series in a heat ramp can share a hue family if their lightness differs. sequential scale against diverging scale at about 8 to 1 is easier to see on a projector than a pair of bright colors with the same weight.

Palettes before the canvas

Open palettes, pick a set that already separates sequential scale from diverging scale, then carry it into the studio. Building the heat ramp with ad-hoc clicks rarely hits 8 to 1 on every label.

Grey for the quiet series

If the heat ramp has one series that is only context, paint it grey and keep the highlight for sequential scale. Do not spend the 8 to 1 step on two categories that are both shouting.

Twelve hues is a warning — sequential-vs-diverging-heat

A categorical heat ramp that needs more colors than you can name will not hold 8 to 1 between neighbors. Split it or switch form before the studio. The palette is not a rainbow picker.

This page is a contrast check for a heat ramp near 8 to 1. It does not recolor the studio for you and it does not replace a full accessibility audit.

Questions

Is 8 to 1 a studio setting for the heat ramp?
Treat it as a check you do with the palette, not as a slider that fixes a bad pair. If sequential scale and diverging scale still blend, change the set before you draw the heat ramp.
Will a color-blind viewer read the heat ramp?
Only if the palette does not rely on red versus green alone. A lightness step near 8 to 1, plus a direct label, carries the heat ramp when hue fails.
Should the studio invent colors for the heat ramp?
No. Bring a palette that already separates sequential scale from diverging scale. The studio applies it. Random picks will miss 8 to 1 on a projector.

Compare palettes · Open the studio

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