DJ Mike's Tutorials: PHP

Imagick Functions

Imagick::negateImage

Description:

bool Imagick::negateImage ( bool $gray [, int $channel ] )

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. Defaults to Imagick::CHANNEL_ALL.

Channel constants

imagick::CHANNEL_UNDEFINED
imagick::CHANNEL_RED
imagick::CHANNEL_GRAY
imagick::CHANNEL_CYAN
imagick::CHANNEL_GREEN
imagick::CHANNEL_MAGENTA
imagick::CHANNEL_BLUE
imagick::CHANNEL_YELLOW
imagick::CHANNEL_ALPHA
imagick::CHANNEL_OPACITY
imagick::CHANNEL_MATTE
imagick::CHANNEL_BLACK
imagick::CHANNEL_INDEX
imagick::CHANNEL_ALL

Return Values

Returns TRUE on success.

Errors/Exceptions

Throws ImagickException on error.

Example

<?php
header("Content-type: image/jpeg");
$image = new Imagick("opossum.jpg"); 
$image->negateImage( FALSE, imagick::CHANNEL_ALL );
echo $image;
?> 

<?php
header("Content-type: image/jpeg");
$image = new Imagick("opossum.jpg"); 
$image->negateImage( FALSE, imagick::CHANNEL_RED );
echo $image;
?> 


^

Created by DJ Mike from Santa Barbara