Imagick::posterizeImage()

(PECL imagick 2.0.0)

Reduces the image to a limited number of color level

说明

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);
?>

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();