Imagick::brightnessContrastImage()

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Description

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。

范例

Example #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();
}
?>