Negates the colors in the reference image. The Grayscale
option means that only grayscale values within the image
are negated.
Parameters
gray
Whether to only negate grayscale pixels within the image.
channel
Provide any channel constant that is valid for your channel mode. To
apply to more than one channel, combine channeltype constants using
bitwise operators. Refer to this
list of channel constants.
Return Values
Returns TRUE on success.
Errors/Exceptions
Throws ImagickException on error.
Examples
Example #1 Imagick::negateImage
<?php function negateImage($imagePath, $grayOnly, $channel) { $imagick = new \Imagick(realpath($imagePath)); $imagick->negateImage($grayOnly, $channel); header("Content-Type: image/jpg"); echo $imagick->getImageBlob(); }