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Imagick::brightnessContrastImage — Description
$brightness
, float $contrast
[, int $channel = Imagick::CHANNEL_DEFAULT
] ) : boolChange the brightness and/or contrast of an image. It converts the brightness and contrast parameters into slope and intercept and calls a polynomical function to apply to the image.
brightness
contrast
channel
成功时返回 TRUE。
Example #1 Imagick::brightnessContrastImage()
<?php
function brightnessContrastImage($imagePath, $brightness, $contrast, $channel) {
$imagick = new \Imagick(realpath($imagePath));
$imagick->brightnessContrastImage($brightness, $contrast, $channel);
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
}
?>