Imagick::brightnessContrastImage

    (PECL imagick 3 >= 3.3.0)

    Imagick::brightnessContrastImage — Change the brightness and/or contrast of an image

    说明

    publicImagick::brightnessContrastImage(float$brightness, float$contrast, int$channel = Imagick::CHANNEL_DEFAULT): bool

    Change the brightness and/or contrast of an image. It converts the brightness and contrast parameters into slope and intercept and calls a polynomical function to apply to the image.

    参数

    brightness

    contrast

    channel

    返回值

    成功时返回 true。

    示例

    示例 #1 Imagick::brightnessContrastImage()

    <?php
    function brightnessContrastImage($imagePath, $brightness, $contrast, $channel) {
    $imagick = new \Imagick(realpath($imagePath));
    $imagick->brightnessContrastImage($brightness, $contrast, $channel);
    header("Content-Type: image/jpg");
    echo     $imagick->getImageBlob();
    }

    ?>
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