Adapt color white points

Move color coordinates between viewing references with an explicit chromatic-adaptation method.

D50 source0.7 0.35 0.2 / 0.8

Bradford to D650.678287 0.348911 0.234581 / 0.8

CAT16 to D650.686249 0.357012 0.237624 / 0.8

The reference changes while type and alpha remain

Both methods adapt the D50 source to D65 through XYZ. The returned values remain ProPhotoColor objects with alpha 0.8.

Name both white points and the method

The adaptation API does not infer source or destination viewing conditions. Supply both normalized white points and select Bradford or CAT16 explicitly.

<?php

use PhpColor\Color\Color;
use PhpColor\Color\Colorimetry\Adaptation\Adapt;
use PhpColor\Color\Colorimetry\Illuminant;

$source = Color::parse(
    'color(prophoto-rgb 0.7 0.35 0.2 / 0.8)',
);

$adapted = Adapt::color(
    $source,
    Illuminant::D50->whitePoint(),
    Illuminant::D65->whitePoint(),
    'bradford',
);

echo $adapted->toCss();
// color(prophoto-rgb 0.678287 0.348911 0.234581 / 0.8)

Adaptation needs colorimetric context

The API accepts any source and destination white points you provide. It does not inspect an ICC profile, viewing environment, device, or file metadata to determine whether adaptation is appropriate.

SourceAn explicit reference white.

DestinationAn explicit reference white.

MethodBradford or CAT16.

PreservedConcrete type and alpha channel.

Adapt color white points

The reference changes while type and alpha remain

Name both white points and the method

Adaptation needs colorimetric context

Adapt color coordinates with intent