Imagick::posterizeImage

    (PECL imagick 2, PECL imagick 3)

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

    Description

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

    Reduces the image to a limited number of color level.

    Parameters

    levels

    dither

    Return Values

    Returns true on success.

    Examples

    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);

    ?>

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    User Contributed Notes 1 note

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    1
    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();
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