PHP | Imagick recolorImage() Function

The Imagick::recolorImage() function is an inbuilt function in PHP which is used to translate, scale, shear, or rotate image colors. This function is used as the matrix size variable. Normally 5×5 matrix is used for RGBA and 6×6 is used for CMYK. 
Syntax:

bool Imagick::recolorImage( $matrix )

Parameters: This function accepts single parameter $matrix which is used to store the value of the color matrix.
Return Value: This function returns True on success.
Original Image:

Below program illustrate Imagick::recolorImage() function in PHP:
Program 1:

php

<?php

// Create new Imagick object
$imagick = new \Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-19.png');

// Color Matrix
$remapColor = [ 1, 0, 0,
                0, 0, 1,
                0, 1, 0, ];

// Recolor the Image
$imagick->recolorImage($remapColor);
header("Content-Type: image/jpg");

// Display the image
echo $imagick->getImageBlob();
?>

Output:

Program 2:

php

<?php

$string = "Computer Science portal for Geeks!";

// Creating new image of above String
// and add color and background
$im = new Imagick();
$draw = new ImagickDraw();

// Fill the color in image
$draw->setFillColor(new ImagickPixel('green'));

// Set the text font size
$draw->setFontSize(50);

$matrix = $im->queryFontMetrics($draw, $string);
$draw->annotation(0, 40, $string);
$im->newImage($matrix['textWidth'], $matrix['textHeight'],
        new ImagickPixel('white'));

// Draw the image
$im->drawImage($draw);

// Recolor the Image
$remapColor = [ 1, 300, 70,
                10, 0, 40,
                10, 10, 0, ];

$im->recolorImage($remapColor);

$im->setImageFormat('jpeg');

header("Content-Type: image/jpg");

// Display the output image
echo $im->getImageBlob();
?>

Output:

Reference: http://php.net/manual/en/imagick.recolorimage.php