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    Imagick::setImageType

    (PECL imagick 2, PECL imagick 3)

    Imagick::setImageType — Sets the image type

    Description

    public Imagick::setImageType(int $image_type): bool

    Sets the image type.

    Parameters

    image_type

    Return Values

    Returns true on success.

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    User Contributed Notes

    quickshiftin at gmail dot com
    10 years ago
    The cleaner way to set the type to grayscale is to use the Imagick class constant.

    $oBw = new \Imagick($sSourceImage);
    $oBw->setImageType(\Imagick::IMGTYPE_GRAYSCALE);

    I've found this to be a rather harsh 'convert to grayscale' approach. Fred's color2gray script works much better, but it's written in Bash. Time to get it ported over lol

    http://www.fmwconcepts.com/imagemagick/color2gray/index.php
    Simon J
    5 years ago
    The different image types that can be specified are (from the Imagick::getImageType doc page):

    Imagick::IMGTYPE_UNDEFINED
    Imagick::IMGTYPE_BILEVEL
    Imagick::IMGTYPE_GRAYSCALE
    Imagick::IMGTYPE_GRAYSCALEMATTE
    Imagick::IMGTYPE_PALETTE
    Imagick::IMGTYPE_PALETTEMATTE
    Imagick::IMGTYPE_TRUECOLOR
    Imagick::IMGTYPE_TRUECOLORMATTE
    Imagick::IMGTYPE_COLORSEPARATION
    Imagick::IMGTYPE_COLORSEPARATIONMATTE
    Imagick::IMGTYPE_OPTIMIZE

    The MATTE variants are equivalent to GrayscaleAlpha, etc. in the ImageMagick command line. If you're making something grayscale, I would recommend using IMGTYPE_GRAYSCALEMATTE.

    <?php

    $im    ->setImageType(Imagick::IMGTYPE_GRAYSCALEMATTE);

    ?>
    lee dot traynor at skeptic dot de
    13 years ago
    This function can be used to desaturate an image, i.e. to convert a coloured image into a greyscale:

    <?php

    $im     = new Imagick ("image.jpg");
    $im->setImageType (2);
    //is now in 256 shades of grey

    ?>
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