PHP | ImagickPixel getColorValue() function

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

<?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

<?php
// Create a new imagick object
$imagick = new Imagick(
    'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-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