PHP マニュアル: Change the brightness and/or contrast of an image

説明

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

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.

パラメータ

brightness
contrast
channel

戻り値

成功した場合に true を返します。

例

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();
}

?>