Imagick::posterizeImage

(PECL imagick 2, PECL imagick 3)

Imagick::posterizeImage — Reduces the image to a limited number of color level

说明

public Imagick::posterizeImage ( int $levels , bool $dither ) : bool

Reduces the image to a limited number of color level.

参数

levels
dither

返回值

成功时返回 true。

范例

Example #1 Imagick::posterizeImage()


<?php
function posterizeImage($imagePath, $posterizeType, $numberLevels) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->posterizeImage($numberLevels, $posterizeType);
    $imagick->setImageFormat('png');
    header("Content-Type: image/png");
    echo $imagick->getImageBlob();
}

posterizeImage($imagePath, \Imagick::DITHERMETHOD_RIEMERSMA, 8);

?>

User Contributed Notes

linspb at gmail dot com 24-Jul-2017 02:19


At PHP 7.x before



$im->posterizeimage(2, FALSE);



do



$im->setImageType(imagick::IMGTYPE_COLORSEPARATION);



on PHP 5.x working without setImageType well.



Example:

$im = new Imagick();

$r = $im->readImageBlob($label);

if (!$r) {

    return FALSE;

}

$im->setImageType(imagick::IMGTYPE_COLORSEPARATION);

$im->posterizeimage(2, 0);

$bmp = $im->getImageBlob();