PHP | imagepalettetotruecolor() Function

The imagepalettetotruecolor() function is an inbuilt function in PHP which is used to convert an palette based image to true color.
Syntax:

bool imagepalettetotruecolor( resource $src )

Parameters: This function accepts a single parameter $src which holds the image to work on.
Return Value: This function returns TRUE if the conversion was complete, or if the source image already is a true color image, otherwise FALSE is returned.
Below given programs illustrate the imagepalettetotruecolor() function in PHP:
Program 1:

php

<?php

// Create an image
$image = imagecreate(700, 200);

echo '<b>Before conversion:</b> <br>';

// Check the image type
check($image);

echo '<b><br>After conversion:</b> <br>';

// Convert image to true color
imagepalettetotruecolor($image);

// Check the image type
check($image);

// Function for checking the image type
function check($image) {
    echo 'Type of image is ' . (imageistruecolor($image)
             ? 'true color' : 'palette');
}
?>

Output:

Before conversion:
Type of image is palette
After conversion:
Type of image is true color

Program 2:

php

<?php

// Create an image of palette type
$image = imagecreate(700, 200);

// Convert image to true color
imagepalettetotruecolor($image);

// Prepare red color
$red = imagecolorallocate($image, 0xFF, 0x00, 0x00);

// Add text to the image using a local font file
imagefttext($image, 100, 0, 0, 130, $red,
       './RugeBoogie-Regular.ttf', 'GeeksforGeeks');

// Output to browser
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

Output:

Reference: https://www.php.net/manual/en/function.imagepalettetotruecolor.php