3.0

3.0

• BREAK: The CSS HDR spec now defines the polar spaces such as JzCzhz color() with hue channels that support
  traditional hue syntax instead of percentages. Updated all polar spaces that are represented in the color() format
  to support this change. This is likely low impact as using percentages for hues is fairly uncommon.
• BREAK: Remove previously deprecated functions: algebra.apply, algebra.no_nans, algebra.no_nan,
  algebra.is_nan, Labish.labish_names, Labish.labish_indexes, LChish.lchish_names, and
  LCHish.lchish_indexes. These were mainly used internally, so breakage is likely low.
• NEW: jzazbz, jzczhz, ictcp, rec2100-pq, and rec2100-hlg are now formally recognized, and by default
  serialized, without the -- prefix as all the spaces are now part of the official HDR specification in CSS.
  Previously, the spec was unofficial. -- prefixed names will still be recognized, but at some future time --
  support will be removed for these spaces. Additionally, these spaces are now registered by default.
• NEW: ∆E methods z and itp are now registered by default as their associated color spaces are now registered
  by default as well.
• NEW: Color space channel flags FLG_PERCENT and FLG_OPT_PERCENT are deprecated and no longer used. They are
  still present, but will be removed in the future.
• NEW: Update CSS percentage input/output ranges for jzazbz, jzczhz, and ictcp to match the CSS HDR spec.
• NEW: Ray tracing gamut mapping algorithms have been added: oklch-raytrace and lch-raytrace.
• NEW: RGB spaces now expose a linear() function on the underlying class to specify if they have a linear
  equivalent.
• NEW: Adjust inheritance order of RGB spaces. Previously, many inherited from sRGB, now they inherit from
  sRGBLinear.
• NEW: Add rec2100-linear, essentially and alias for rec2020-linear, that is specified in the CSS HDR
  specification.
• FIX: Ensure that when using discrete interpolation that spline based interpolations are truly discrete.

2.16

2.16

• NEW: Gamut mapping plugins now must accept a space parameter and the color will not already be in the desired
  gamut color space. This change was specifically made in order to fix a bug with HCT gamut mapping.
• FIX: Fix corner cases in HCT gamut mapping that would struggle with colors with high chroma and low lightness.

2.15.1

2.15.1

• FIX: Small regression related to indirectly gamut mapping in another space other than its own.

2.15

2.15

• BREAK: ∆E HCT used an extremely small JND by default to yield tonal palettes that were comparable to Google's
  Material. This was not inline with other gamut mapping function defaults. The default is now a more appropriate
  value of 2. Users that relied on ∆E HCT to help generate tonal pallets with HCT should now use the jnd parameter
  to set the JND to 0.02 in order to generate tonal pallets more like Google.
• NEW: fit() now accepts a jnd option to control the JND limit when gamut mapping with lch-chroma,
  oklch-chroma, and hct-chroma.
• NEW: to_string() can now accept a dictionary of arguments to control gamut mapping via the fit argument.
• FIX: Update lch-chroma epsilon to be consistent with other gamut mapping plugin conventions.

2.14.1

2.14.1

• FIX: More precision for HCT conversion for better round trip conversions.

2.14

2.14

• NEW: normalize() will now also normalize a cylindrical color model with negative chroma/saturation to its
  positive chroma/saturation form, assuming one exists.
• NEW: Gamut clipping is performed on a cylindrical color's normalized form ensuring that a color which is in
  gamut but has a negative chroma/saturation will be mapped more correctly.
• NEW: Do not clamp user input of lightness and chroma in various spaces. Clamping will only occur during
  conversion if the algorithm requires it.
• NEW: Channels can be accessed by get and set using their numerical value (as a string input).
• NEW: Color space plugins that specify the gamut space via GAMUT_CHECK must use that color space as a
  reference when when gamut mapping or clipping by default.
• NEW: New color space plugin attribute CLIP_SPACE added which will override the space specified by
  GAMUT_CHECK to force clipping in the origin space even if a gamut mapping space is defined. This is only used when
  it is advantageous to clip in the origin space, e.g. when faster and still practical.
• NEW: Deprecate non-standard CAM16 (Jab) space. People should use the standard CAM16 JMh or the CAM16 UCS, SCD,
  or LCD Jab spaces. The non-standard Jab is still available via coloraide.spaces.cam16.CAM16, but it is no longer
  available in coloraide.everything and will be removed at a future time.
• NEW: Add new channel aliases: j for jz in Jzazbz and JzCzhz. Also add c for cz and h for hz in
  JzCzhz.
• NEW: HSL will now always return positive saturation for wide gamut colors via its conversion.
• FIX: Fix a an issue with the CAM16 model's transformation that prevented good round trip with negative
  lightness.
• FIX: Ensure that when harmony auto creates a cylindrical space from a rectangular space that it checks
  achromatic status in the original color space.
• FIX: ∆E HCT should use colorfulness, not chroma, in the calculation.
• FIX: Don't return scientific notation when serializing colors.
• FIX: Small fix for Rec. 2100 PQ conversion algorithm.
• FIX: The oRGB color space should be gamut mapped in srgb as it is a transform of the sRGB space.
• FIX: Because Okhsl and Okhsv have a rough sRGB approximation and not precise, they are instead gamut mapped to
  their own gamut by default.
• FIX: Much more accurate ICtCp matrices.
• FIX: Fix typing of deeply nested arrays in algebra.
• FIX: Fix issue with HCT undefined channel resolver.
• FIX: Proper handling of negative lightness for DIN99o.
• FIX: Circular mean should return positive values.

2.13.1

2.13.1

• FIX: Minor typing regressions and fixes.

2.13

2.13

• NEW: Performance related enhancements in high traffic calculations.
• NEW: Use matmul instead of dot in calculations to not confuse math savvy people.
• FIX: Some typing fixes/improvements.
• FIX: Minor fixes to algebra library.

2.12

2.12

• NEW: When serializing, percent can now take a sequence of booleans to indicate which channels are desired to
  be represented as a percentage, alpha included.
• NEW: color() serializing now supports string output with percent.
• FIX: When serializing, the alpha channel is no longer handled special with a minimum value of 5. Precision is
  equally applied to all channels.

2.11

2.11

• NEW: Add new css-linear interpolator that provides compatibility with the CSS specification. This deviates
  from the default linear interpolator in how undefined hues are resolved for interpolation, particularly noticeable
  with longer hue resolution.
• NEW: Add new INTERPOLATOR class option to change the default interpolator that is used.