This release adds several new color spaces:

• A98, compatible with Adobe RGB (1998): a98
• Display P3: p3
• Rec. 2020: rec2020
• ProPhoto RGB: prophoto
• XYZ with D65 illuminant: xyz65
• JzAzBz in cartesian (jab) and polar (jch) form (#73)

Bug fixes:

• Fixes achromatic RGB to Lab conversion

Implements the average(colors, mode) function (#78)

• Make color deficiency filter functions use names consistent with other filters: filterDeficiencyProt, filterDeficiencyDeuter, filterDeficiencyTrit.
• All filters now return values in the color space of the original color passed to them.

Implements filterHueRotate.

Adds the following filter functions, as per the Filter Effects Module Level 1 spec: filterBrightness, filterContrast, filterInvert, filterSepia, filterSaturate, filterGrayscale. Adds mapping functions mapTransferLinear and mapTransferGamma.

Added sideEffects: false in package.json. Please open an issue if that causes any problem with your setup.

Implemented more hue fixup methods (#93):

• add fixupHueShorter(), fixupHueLonger(), fixupHueIncreasing(), fixupHueDecreasing() methods;
• alias interpolateHue() to fixupHue() — the former will probably be removed from the API at some point
• add fixupAlpha() method, slightly different than the old interpolateAlpha();
• alias interpolateAlpha() to fixupAlpha() — the former will probably be removed from the API at some point

New methods:

• formatHex8()
• mapper()
• mapAlphaMultiply()
• mapAlphaDivide()
• interpolateWith(premap, postmap)
• interpolateWithPremultipliedAlpha()

Fixes bug in interpolateSplineMonotone() to make it actually monotone (see #91, thanks @Fil!)

Features

• Implemented deficiencyProt(), deficiencyDeuter() and deficiencyTrit() functions to simulate color vision deficiencies (CVD); (#54)

Breaking changes

• Removed the gray() shorthand for Lab colors, to match the latest version of css-color-4;

Deprecations

A couple of umbrella functions have been split into individual functions:

• Instead of formatter(), use formatterHex and formatterRgb directly;
• likewise, instead of clamp(), use clampRgb and clampChroma.

Fixes lab() and lch() parsers to allow an optional percentage in the L channel, as per changes in the css-colors-4 spec #85; thanks @rozaxe!