imageistruecolor

(PHP 4 >= 4.3.2, PHP 5, PHP 7)

Finds whether an image is a truecolor image

bool imageistruecolor ( resource $image )

imageistruecolor() finds whether the image image is a truecolor image.

Parameters:

image

An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().

Returns:

Returns TRUE if the image is truecolor, FALSE otherwise.

Notes:

This function requires GD 2.0.1 or later (2.0.28 or later is recommended).

Examples:

Simple detection of true color image instances using imageistruecolor()

<?php
// $im is an image instance

// Check if image is a true color image or not
if(!imageistruecolor($im))
{
    // Create a new true color image instance
    $tc = imagecreatetruecolor(imagesx($im), imagesy($im));

    // Copy over the pixels
    imagecopy($tc, $im, 0, 0, 0, 0, imagesx($im), imagesy($im));
    imagedestroy($im);

    $im = $tc;
    $tc = NULL;

    // OR use imagepalettetotruecolor()
}

// Continue working with image instance
?>