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Changelog

All Notable changes to iris will be documented in this file.

2025-12-05

Added

  • gradient() method to generate color scales between two or more colors (#51)
    • Supports two-color gradients: $colorA->gradient($colorB, $steps)
    • Supports multicolor gradients with pivot colors: $colorA->gradient([$colorB, $colorC], $steps)
    • Works with all color types (Hex, RGB, HSL, HSV, CMYK, OKLCH, etc.)
    • Returns array of colors matching the starting color type

Fixed

  • CMYK to RGB conversion now rounds values to produce valid integers
    • Previously, CMYK values that didn't produce clean 0 or 255 RGB values would fail validation

2025-12-02

Added

  • OKLCH color space support - perceptually uniform color representation
  • toOklch() method on all color classes
  • Oklch::fromRgb() static factory method for RGB to OKLCH conversion
  • clone() method for color objects
  • alphaRaw() protected method for internal alpha precision handling
  • Comprehensive alpha conversion tests

Changed

  • Breaking: Minimum PHP version is now 8.1
  • Breaking: PHPUnit upgraded to ^10.0|^11.0
  • GitHub Actions workflow updated for PHP 8.1, 8.2, 8.3, and 8.4

Fixed

  • RGBA to Hexa conversion now preserves original RGB values instead of alpha-compositing (#48)
  • HSLA to Hexa conversion now preserves original RGB values (#48)
  • Alpha channel precision in conversions (#37)
  • Alpha float to hex conversion now properly zero-pads single digit hex values

Removed

  • Travis CI configuration (migrated to GitHub Actions)
  • EditorConfig file
  • PHP CodeSniffer dependency

2022-02-08

  • Remove PHP 7 support, will only support PHP 8
  • Added type hinting and return type declarations
  • Made BaseColor::back() and BaseColor::getColorModelName() public @rv1971
  • Use non-locale aware output for the alpha value @Jako
  • Updated .gitignore, and some code refactoring @kudashevs

2021-10-05

  • Added Hexa support.

2021-01-31

  • Fix HSL to HSV conversion.

2020-12-06

  • PHP 8.0 support.

2019-10-12

  • Added Factory class to attempt to guess the color.

2018-10-02

  • Added shade method.

2018-10-01

  • Added tint method.

2018-04-08

  • Added isLight and isDark methods.

2017-10-03

  • Added HSLA and RGBA support.

2017-05-30

  • Initial release.
  • Hex, HSL, HSV and RGB support.
  • Saturate, desaturate, grayscale, lighten, darken, brighten, spin and mix operations.