PHP | ImagickPixel getColorValue() function

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The ImagickPixel::getColorValue() 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 is a floating-point number between 0 and 1.

Syntax:

float ImagickPixel::getColorValue( 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 float value containing the normalized value of the color value.

Exceptions: This function throws ImagickException on error.

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

<?php 
// Create a new imagickPixel object 
$imagickPixel = new ImagickPixel('#ad4c45'); 
  
// Get the Color value with imagick::COLOR_RED 
$colorValue = $imagickPixel->getColorValue(imagick::COLOR_RED); 
echo $colorValue; 
?> 

Output:

0.67843137254902

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 301th pixel 
$getPixel = $histogramElements[300]; 
  
// Get the Color value with imagick::COLOR_GREEN 
$colorValue = $getPixel->getColorValue(imagick::COLOR_GREEN); 
  
echo $colorValue; 
?> 

Output:

0.29803921568627

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

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