Discards all but one of any pixel color

# Imagick::uniqueImageColors

(PECL imagick 2,PECL imagick 3)

Imagick::uniqueImageColors — Discards all but one of any pixel color

### Description

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.

### Parameters

This function has no parameters.

### Return Values

Returns `true` on success.

### Examples

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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