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Feature/add din99c and din99d #230

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e48bd3f
feat: adds DIN99c and DIN99d (conversion to only)
rumpelrausch Feb 11, 2024
7e19a50
fix: allows difference factories, corrects ranges
rumpelrausch Feb 11, 2024
a4dcb62
refactor: removes IDE linter errors
rumpelrausch Feb 11, 2024
6d998f9
docs: describes DIN99c/d color spaces
rumpelrausch Feb 11, 2024
9c1069a
refactor: removes unused code
rumpelrausch Feb 11, 2024
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docs: describes DIN99c/d color spaces
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rumpelrausch committed Feb 11, 2024
commit 6d998f9a60d616be688037cc15a6eb05736fd7db
45 changes: 45 additions & 0 deletions docs/color-spaces.md
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Expand Up @@ -277,6 +277,51 @@ Serialized as `color(--din99o-lch l c h)`, with the `none` keyword for any missi

Does not have gamut limits.

### DIN99c and DIN99d

DIN99c and DIN99d are "spinoffs" of DIN99b which itself is derived from DIN99. For color distance calculation they are said to perform better than DIN99o, especially in the blue areas, and are comparable in quality to the complex CIE2000 formula.

The sole purpose of these color spaces is highly performant distance calculation, so only conversion _to_ DIN99c/d is implemented.
The models also contains chroma and hue channels as supporting information.

The color distance (deltaE) function factories are:
```js
culori.differenceEuclidean('d99c')
culori.differenceEuclidean('d99d')
```
If needed outside of culori, distance calculation is:<br>
```text
&Delta;E = SQRT( &Delta;L<sup>2</sup> + &Delta;a<sup>2</sup> + &Delta;b<sup>2</sup> )
```

#### `din99c`

DIN99c color space in cartesian and cylindrical form.

| Channel | Range | Description |
| ------- | -------------------- | ----------- |
| `l` | `[0, 100]` | Lightness |
| `a` | `[-55, 55]`≈ |
| `b` | `[-55, 55]`≈ |
| `c` | `[0, 55]`≈ | Chroma |
| `h` | `[0, 360)` | Hue |

Does not have gamut limits.

#### `din99d`

DIN99d color space in cartesian and cylindrical form.

| Channel | Range | Description |
| ------- | -------------------- | ----------- |
| `l` | `[0, 100]` | Lightness |
| `a` | `[-55, 55]`≈ |
| `b` | `[-55, 55]`≈ |
| `c` | `[0, 55]`≈ | Chroma |
| `h` | `[0, 360)` | Hue |

Does not have gamut limits.

### Oklab, Oklch, Okhsl, Okhsv

The [Oklab color space](https://bottosson.github.io/posts/oklab/), in Cartesian (Lab) and cylindrical (LCh) forms. It uses the D65 standard illuminant.
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