Update dependency color to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
color (changelog)	1.8 → 2.1.2

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Release Notes

halostatue/color (color)

v2.1.2

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• Updated to Contributor Covenant 3.0 and applied updates to several support
  documents.

• Full coverage of conversion tests. Adds CIELAB to_yiq and Grayscale to_xyz
  methods. Only YIQ now lacks conversions support. Fixed in [#​69][pr-69].

• Fix an incorrect conversion of CIELAB colors with low lightness to XYZ, which
  caused the Y component to be ~903 times larger than correct. In practice, this
  returned unexpectedly bright colours.

  This also affected conversion from CIELAB to RGB, CMYK, HSL, YIQ, and
  grayscale, which convert from CIELAB to XYZ as an intermediate step.

  Reported by @​alexwlchan in [#​95][issue-95] and fixed in [#​96][pr-96].

• Fix an incorrect comparison when converting CIE XYZ colors to RGB that could
  raise a NoMethodError when constructing the RGB value. The conversion
  incorrectly compared the absolute value of an intermediate value against the
  0.0031308 threshold instead of comparing the original value, causing certain
  negative values to follow the wrong branch and return complex RGB components.

  This also affected conversion from XYZ to CMYK, HSL, and YIK, and from CIELAB
  to RGB, HSL, YIQ, and Grayscale -- all of which convert from XYZ to RGB as an
  intermediate step.

  Reported by @​alexwlchan in [#​92][issue-92] and fixed in [#​93][pr-93].

v2.1.1

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Color 2.1.1 fixes a bug where Color::RGB::Black and Color::RGB::White are no
longer defined automatically because they are part of color/rgb/colors.
Internally, this defines Color::RGB::Black000 and Color::RGB::WhiteFFF.

v2.1.0

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Color 2.1.0 fixes a computation bug where CIE XYZ values were improperly clamped
and adds more Color::XYZ white points for standard illuminants.

• Fixes a bug where standard illuminant white points were improperly clamped and
  was seen in Color::RGB#to_lab since CIELAB conversions must go through the
  XYZ color model. Even though we were using the D65 white point, the Z value
  was being clamped to 1.0 instead of the correct value of ≅1.08. Reported by
  @​r-plus in [#​45][issue-45] and fixed in [#​45][pr-46].

  The resulting Color::LAB values are not exactly the same values under Color
  1.8, but they are within fractional differences deemed acceptable.

• Added more white points for standard illuminants in the Color::XYZ::WP2
  constant. The values here were derived from the
  [White points of standard illuminants][wp-std-illuminant] using the xyY to
  XYZ conversion formula where X = (x * Y) / y and
  Z = ((1 - x - y) * Y) / y. Only the values for CIE 1931 2° were computed.
  The values for Color::XYZ::D50 and Color::XYZ::D65 were replaced with these
  computed values.

v2.0.1

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Color 2.0.1 is a minor documentation update.

v2.0.0

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Color 2.0.0 is a major release of the Color library.

💣 Breaking Changes

Color 2.0 contains breaking changes. Functionality previously deprecated has
been removed, but other functionality has been changed or removed as part of
this release without prior warning.

• The minimum supported version of Ruby is 3.2.

• Color classes are now immutable implementations of Data objects (first
  introduced in Ruby 3.2). This will restrict Color 2 from running on versions
  of JRuby before JRuby 10.

• The constants Color::COLOR_VERSION and Color::COLOR_TOOLS_VERSION have
  been removed; there is only Color::VERSION. This reverses a planned
  deprecation decision made more than ten years ago that no longer makes sense.

• All named color classes at Color have been removed as planned.

• Color::RGB::BeccaPurple has been removed as an alias for
  Color::RGB::RebeccaPurple.

• The pseudo-constructor Color.new has been removed.

• Color class constructors no longer yield the constructed color if a block is
  passed.

• Renamed Color::COLOR_EPSILON and Color::COLOR_TOLERANCE to
  Color::EPSILON and Color::TOLERANCE. These aren't private constants
  because they need to be accessed throughout Color, but they are internal
  constants that should not be used outside of the Color library or functions
  exposed therein.

• PDF format functions #pdf_fill and #pdf_stroke have been removed from
  Color::CMYK, Color::Grayscale, and Color::RGB. The supporting internal
  constants Color::<class>::PDF_FORMAT_STR have also been removed.

• Palette processing classes, Color::Palette::AdobeColor,
  Color::Palette::Gimp, and Color::Palette::MonoContrast have been removed.
  Persons interested in using these are encouraged to extract them from
  [Color 1.8][color-1.8] and adapt them to use Color 2.0 APIs.

• CSS methods (#css_rgb, #css_rgba, #css_hsl, #css_hsla) have been
  replaced with #css on color classes that have CSS representations. The
  output of #css differs (Color 1.8 used the legacy CSS color formats; Color
  2.0 uses modern CSS color formats).

• Color::GrayScale has been renamed to Color::Grayscale. The alias constant
  Color::GreyScale has been removed.

• The #html method has been removed from all color classes except Color::RGB.

• Named RGB colors are no longer defined automatically, but must be loaded
  explicitly by requiring color/rgb/colors. This resolves [#​30][issue-30]. The
  use of Color::RGB#extract_colors, Color::RGB.by_hex, Color::RGB.by_name,
  or Color::RGB.by_css will require color/rgb/colors automatically as they
  require the presence of the named colors.

• Color:CSS#[] has been removed, as has the containing namespace. It has
  always been a shallow wrapper around Color::RGB.by_name.

🚀 New Features

• Color::CIELAB and Color::XYZ namespaces have been added. Separate
  implementations were submitted by David Heitzman and @​stiff (in [#​8][pr-8] and
  [#​11][pr-11]), but I have reworked the code substantially. These
  implementations were originally as Color::LAB and include a new contrast
  calculation using the ΔE*00 algorithm.

Internal

• Updated project structure for how I manage Ruby libraries in 2025. This
  includes increased release security (MFA is required for all releases,
  automated releases are enabled), full GitHub Actions, Dependabot, Standard
  Ruby, and more.

• Charles Nutter re-added JRuby support in CI. [#​36][pr-36]

Governance

Color 2.0 and later requires that all contributions be signed-off attesting that
the developer created the change and has the appropriate permissions or
ownership to contribute it to this project under the licence terms.

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