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docs: clarify Lab and Lch round trips #400

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docs: clarify Lab and Lch round trips #400

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14 changes: 12 additions & 2 deletions docs/src/index.md
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Expand Up @@ -193,6 +193,17 @@ chroma.lch(80, 40, 130);
chroma(80, 40, 130, 'lch');
```

When round-tripping colors through `Lab` or `Lch`, keep the same Lab white
point for the whole conversion chain. Chroma.js uses D65 by default, while some
other color tools and CSS Color 4 examples use D50. Mixing those assumptions can
produce visibly different RGB results, even if the `Lch` values themselves have
not been intentionally changed. If you need to match another tool, set the Lab
white point explicitly before converting:

```js
chroma.setLabWhitePoint('D50');
```

### chroma.hcl
#### (hue, chroma, lightness)

Expand Down Expand Up @@ -414,6 +425,7 @@ chroma
.colors(5);
```


Of course you can also just construct the scale from the official 5-step colors that you can copy and paste from [colorbrewer2.org](https://colorbrewer2.org/#type=diverging&scheme=RdBu&n=5):

```js
Expand Down Expand Up @@ -1095,5 +1107,3 @@ chroma.cubehelix()
.correctLightness()
.colors(5);
```