(PECL imagick 2,PECL imagick 3)
Imagick::uniqueImageColors — Discards all but one of any pixel color
public Imagick::uniqueImageColors ( ) : bool
Discards all but one of any pixel color. This method is available if Imagick has been compiled against ImageMagick version 6.2.9 or newer.
Returns true on success.
Example #1 Imagick::uniqueImageColors()
<?php
function uniqueImageColors($imagePath) {
$imagick = new \Imagick(realpath($imagePath));
//Reduce the image to 256 colours nicely.
$imagick->quantizeImage(256, \Imagick::COLORSPACE_YIQ, 0, false, false);
$imagick->uniqueImageColors();
$imagick->scaleimage($imagick->getImageWidth(), $imagick->getImageHeight() * 20);
header("Content-Type: image/png");
echo $imagick->getImageBlob();
}
?>
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https://www.php.net/manual/en/imagick.uniqueimagecolors.php