PHP | GmagickPixel getcolorvalue() Function

Last Updated : 23 Jan, 2020
The GmagickPixel::getcolorvalue() function is an inbuilt function in PHP which is used to get the normalized value of the provided color channel for a given GmagickPixel color. The normalized value is a floating-point number between 0 and 1. Syntax: 
float GmagickPixel::getcolorvalue( int $color )
Parameters: This function accepts a single parameter $color which holds an integer value corresponding to one of 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)
Return Value: This function returns the value of the color channel specified as a floating-point number between 0 and 1. Exceptions: This function throws GmagickPixelException on error. Below given programs illustrate the GmagickPixel::getcolorvalue() function in PHP: Program 1: php 
<?php 

// Create a new gmagickPixel object 
$gmagickPixel = new GmagickPixel('#ad4c45'); 
  
// Get the Color value with imagick::COLOR_RED 
$colorValue = $gmagickPixel->getcolorvalue(gmagick::COLOR_RED); 
echo $colorValue; 
?>
Output: 
0.67843137254902
Used Image: Program 2: php 
<?php

// Create a new Gmagick object
$gmagick = new Gmagick('geeksforgeeks.png');

// Get the image histogram 
$histogramElements = $gmagick->getimagehistogram(); 
   
// Get the 301th pixel 
$getPixel = $histogramElements[300]; 
  
// Get the Color value with gmagick::COLOR_GREEN 
$colorValue = $getPixel->getcolorvalue(gmagick::COLOR_GREEN); 
  
echo $colorValue; 
?>
Output: 
0.29803921568627
Reference: https://www.php.net/manual/en/gmagickpixel.getcolorvalue.php
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