COLOR TOOLS

Description

Set of classes used to convert colors and calculate color difference.

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Features

• Model conversion:

  • xy,
  • xyY,
  • XYZ,
  • L*ab,
  • L*uv,
  • L*CH.
  • L*CH UV.
  • HSV,
  • HSL,
  • RGB for primaries *:
    • Adobe 1998 RGB,
    • Apple RGB,
    • Best RGB,
    • Beta RGB,
    • Bruce RGB,
    • CIE RGB,
    • ColorMatch RGB,
    • Don RGB 4,
    • ECI RGB v2,
    • Ekta Space PS5,
    • NTSC RGB,
    • PAL/SECAM RGB,
    • ProPhoto RGB,
    • Radiance RGB,
    • Rec.709,
    • SMPTE-C RGB,
    • sRGB,
    • WideGamutRGB.

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  * custom-defined primaries also supported.

• Chromatic adaptation transformations matrices:

  • Bradford,
  • CIECAT02,
  • CMCCAT2000,
  • Sharp.
  • Von Kries,
  • XYZ Scaling,

• White point dictionary of standard illuminants:

  (2° and 10° standard observer)

  • A,
  • B,
  • C,
  • D50, D55, D65, D75, D93,
  • E,
  • F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12,
  • LED_B1, LED_B2, LED_B3, LED_B4, LED_B5, LED_BH1, LED_RGB1, LED_V1, LED_V2.

• DeltaE difference:

  Check color distance in various algorithms:

  • CIE76,
  • CIE94,
  • CIE00 (CIEDE2000),
  • CMC l:c.

• Contrast ratio calculation.

Sources

• Bruce Lindbloom @ brucelindbloom.com
• Color topics for programmers @ CodeProject.com
• The CIEDE2000 Color-Difference Formula: Implementation Notes, Supplementary Test Data, and Mathematical Observations | Gaurav Sharma, Wencheng Wu, Edul N. Dalal @ rochester.edu
• The RGB-XYZ Matrix Calculator @ russellcottrell.com
• Calculate color temperature (CCT) from CIE 1931 xy coordinates @ waveformlighting.com
• had to know... Technology Articles @ had2know.org
• Standard Illuminants - White points of standard illuminants @ Wikipedia.org
• LMS color space @ wikipedia.org

Requirements

PHP 8.1