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。

示例

示例 #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);

?>

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linspb at gmail dot com ¶

7 years ago

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();