PHP | Imagick opaquePaintImage() Function

The Imagick::opaquePaintImage() function is an inbuilt function in PHP which is used to replace the target color with the specified fill color value of any pixel that matches the target color.

Syntax:

bool Imagick::opaquePaintImage( $target, $fill, $fuzz,
                   $invert, $channel = Imagick::CHANNEL_DEFAULT ] )

Parameters: This function accepts five parameters as mentioned above and described below:

• $target: This parameter holds the ImagickPixel object or target color which need to be changed.
• $fill: This parameter holds the color for replacement.
• $fuzz: This parameter holds the amount of fuzz that will be in float type.
• $invert: Switch between 0 and 1 where 0 is normal and 1 is inverse.
• $channel: This parameter holds the Imagick channel constants that provide any channel constant which is valid for channel mode. More than one channel can be combined using bitwise operators.

Return Value: This function returns TRUE on success or FALSE on failure.

Below programs illustrate the Imagick::opaquePaintImage() function in PHP:

Program 1:

<?php

// Image Path
$imagePath =
"https://cdncontribute.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png";

// Target color
$target = 'rgb(255, 255, 255)';

// Replacing target color with another color
$fill = 'rgb(255, 234, 128)';
$fuzz = '0.1';

// Initialize invert variable
$invert = '0';

$imagick = new \Imagick($imagePath);

// Set the image format
$imagick->setimageformat('png');

$imagick->opaquePaintImage(
    $target, $fill, $fuzz * \Imagick::getQuantum(), $invert
);

// Use despeckleimage() function to reduce
// the speckle noise in an image
$imagick->despeckleimage();

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

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

?>

Output:

Program 2:

<?php

// Image Path
$imagePath =
"https://media.geeksforgeeks.org/wp-content/uploads/20190826021518/checkerboardgfg.png";

// Target color
$target = 'rgb(255, 255, 255)';

// Replacing target color with another color
$fill = 'rgb(21, 200, 236)';
$fuzz = '0.1';

// Initialize invert variable
$invert = '0';

$imagick = new \Imagick($imagePath);

// Set the image format
$imagick->setimageformat('png');

$imagick->opaquePaintImage(
    $target, $fill, $fuzz * \Imagick::getQuantum(), $invert
);

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

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

?>

Output:

Reference: https://www.php.net/manual/en/imagick.opaquepaintimage.php