PHP | ImagickPixel getColorValueQuantum() function

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The ImagickPixel::getColorValueQuantum() function is an inbuilt function in PHP which is used to get the normalized value of the provided color channel for a given ImagickPixel’s color. The normalized value lies in the quantum range where 65535 is maximum and 0 is lowest on contrary to getColorValue() function where 1 was highest and 0 was lowest.

Syntax:

int ImagickPixel::getColorValueQuantum( int $color )

Parameters:This function accepts a single parameter $color which holds one of 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)

Return Value: This function returns an integer value containing the value of color.

Exceptions: This function throws ImagickException on error.

Below given programs illustrate the ImagickPixel::getColorValueQuantum() function in PHP:
Program 1:

<?php 
// Create a new imagickPixel object 
$imagickPixel = new ImagickPixel('#d4a62a'); 
  
// 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 image histogram 
$histogramElements = $imagick->getImageHistogram(); 
   
// Get the 501th pixel 
$getPixel = $histogramElements[500]; 
  
// Get the Color value with imagick::COLOR_GREEN 
$colorValue = $getPixel->getColorValueQuantum(imagick::COLOR_GREEN); 
  
echo $colorValue; 
?> 

Output:

Reference: https://www.php.net/manual/en/imagickpixel.getcolorvaluequantum.php

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