PHP | ImagickPixel setIndex() Function

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The ImagickPixel::setIndex() function is an inbuilt function in PHP which is used to set the colormap index of the pixel.

Syntax:

bool ImagickPixel::setIndex( int $index )

Parameters: This function accepts a single parameter $index which holds the index to be set.

Return Value: This function returns TRUE on success.

Below programs illustrate the ImagickPixel::setIndex() function in PHP:

Program 1: This program set and return the index for a single pixel.

<?php 
  
// Create a new imagickPixel object 
$imagickPixel = new ImagickPixel(); 
  
// Set the index 
$imagickPixel->setIndex(15); 
  
// Get the index 
$index = $imagickPixel->getIndex(); 
echo $index; 
?> 

Output:

Program 2: This program returns the index value of an image.

<?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(); 
  
$i = 0; 
  
// Loop through pixel rows 
foreach ($imageIterator as $row => $pixels) { 
  
    foreach ($pixels as $column => $pixel) { 
  
        // Set the index 
        $pixel->setIndex($i); 
        echo $pixel->getIndex() . '<br>'; 
        $i++; 
    } 
  
    // Sync the iterator after each iteration 
    $imageIterator->syncIterator(); 
} 
?> 

Output:

0
1
2
3
.
.
.

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

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