PHP | ImagickPixel setColorValueQuantum() function

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The ImagickPixel::setColorValueQuantum() function is an inbuilt function in PHP which is used to set the value of the provided color channel for a given ImagickPixel’s color. The value can be in a range from 0 to 65535.

Syntax:

bool ImagickPixel::setColorValueQuantum( int $color, float $value )

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

$color: It specifies the COLOR constants.
List of all COLOR constants are given below:
- imagick::COLOR_BLACK (11)
- imagick::COLOR_BLUE (12)
- imagick::COLOR_CYAN (13)
- imagick::COLOR_GREEN (14)
- imagick::COLOR_RED (15)
- imagick::COLOR_YELLOW (16)
- imagick::COLOR_MAGENTA (17)
- imagick::COLOR_OPACITY (18)
- imagick::COLOR_ALPHA (19)
- imagick::COLOR_FUZZ (20)
$value: It specifies the value to be set.

Return Value: This function returns TRUE on success.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the ImagickPixel::setColorValueQuantum() function in PHP:

Program 1:

<?php 
// Create a new imagickPixel object 
$imagickPixel = new ImagickPixel(); 
  
// Set the color value 
$imagickPixel->setColorValueQuantum(imagick::COLOR_BLUE, 4500); 
  
// Get the Color value with imagick::COLOR_BLUE 
$colorValue = $imagickPixel->getColorValueQuantum(imagick::COLOR_BLUE); 
echo $colorValue; 
?> 

Output:

Program 2:

<?php 
// Create a new imagick object 
$imagick = new Imagick( 
    'https://media.zambiatek.com/wp-content/uploads/zambiatek-13.png'); 
  
// Get the pixel iterator to iterate through each pixel 
$imageIterator = $imagick->getPixelIterator(); 
$x = 200; 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
    // Loop through the pixels in the row 
    if ($row % 2) { 
        foreach ($pixels as $column => $pixel) { 
            if ($column % 1000) { 
                // Set the color 
                $pixel->setColor("red"); 
  
                // Set the color value of Imagick::COLOR_RED 
                $pixel->setColorValueQuantum(Imagick::COLOR_RED, $x); 
                $x = $x + 1000; 
            } 
        } 
    } 
  
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
  
header("Content-Type: image/jpg"); 
echo $imagick; 
?> 