<?php
$im = new Imagick ("test.jpg");
$red = clone $im;
$red->separateImageChannel (imagick::CHANNEL_RED);
$green = clone $im;
$green->separateImageChannel (imagick::CHANNEL_GREEN);
$red->addImage ($green);
$green->destroy ();
$blue = clone $im;
$blue->separateImageChannel (imagick::CHANNEL_BLUE);
$blue->negateImage();
$red->addImage ($blue);
$blue->destroy();
$red->setFirstIterator ();
$im_new = $red->combineImages (imagick::CHANNEL_ALL);
$im_new->writeImage ("test_rebuilt.png");
echo "<img src="test_b_inverted.png">rn";

$im = new Imagick ("test.jpg");
$im->negateImage(false,Imagick::CHANNEL_BLUE);
$im->writeImage ("test_b_inverted.png");