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  • Imagick::setImageOpacity()

    (PECL imagick 2.0.0)

    Sets the image opacity level

    说明

    Imagick::setImageOpacity(float $opacity): bool

    Sets the image to the specified opacity level.此方法在Imagick基于ImageMagick 6.3.1以上版本编译时可用。 This method operates on all channels, which means that for example opacity value of 0.5 will set all transparent areas to partially opaque. To add transparency to areas that are not already transparent use Imagick::evaluateImage()

    参数

    $opacity

    The level of transparency: 1.0 is fully opaque and 0.0 is fully transparent.

    返回值

    成功时返回TRUE

    范例

    Example #1 A Imagick::setImageOpacity() example

    An example of using Imagick::setImageOpacity()

    <?php
    /* Create the object */
    $image = new Imagick('source.png');
    /* Set the opacity */
    $image->setImageOpacity(0.7);
    /* output the image */
    header('Content-type: image/png');
    echo $image;
    ?>
    
    This function is deprecated from last stable version (3.4.4 - 2019-05-02) of PECL Imagick extension. 
    More info: http://pecl.php.net/package-changelog.php?package=imagick&release=3.4.4
    "setImageAlpha" is the new alternative function, but doesn't work with ImageMagick < 7.
    More info: https://github.com/avalanche123/Imagine/issues/715