public function __construct()
{
parent::__construct(function (ImageInterface $image, Point $point) {
$color = $image->getColorAt($point);
$image->draw()->dot($point, new Color(array('red' => 255 - $color->getRed(), 'green' => 255 - $color->getGreen(), 'blue' => 255 - $color->getBlue())));
});
}
/**
* @param $border If the grayed pixel has a value smaller than $border, the pixel will be whiten. Otherwise the
* color will be black.
* @throws \Imagine\Exception\InvalidArgumentException if border < 0 or border > 255
*/
public function __construct($border)
{
if ($border < 0 || $border > 255) {
throw new InvalidArgumentException('Border has to be between 0 and 255');
}
parent::__construct(function (ImageInterface $image, Point $point) use($border) {
$newColor = $image->getColorAt($point)->getRed() < $border ? 255 : 0;
$image->draw()->dot($point, new Color(array('red' => $newColor, 'green' => $newColor, 'blue' => $newColor)));
});
}
/**
* @param int $brightness the brightnes of the resulting image
* @throws \Imagine\Exception\InvalidArgumentException if $brightness < 0
*/
public function __construct($brightness = 1)
{
if ($brightness < 0) {
throw new InvalidArgumentException('Brightness has to be positive');
}
parent::__construct(function (ImageInterface $image, Point $point) use($brightness) {
$color = $image->getColorAt($point);
$image->draw()->dot($point, new Color(array('red' => min(255, $color->getRed() * $brightness), 'green' => min(255, $color->getGreen() * $brightness), 'blue' => min(255, $color->getBlue() * $brightness))));
});
}
