(PHP 4 >= 4.3.2, PHP 5, PHP 7)
imageistruecolor — Finds whether an image is a truecolor image
imageistruecolor ( resource $image ) : bool
imageistruecolor() finds whether the image image is a truecolor image.
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Returns true if the image is truecolor, false otherwise.
Example #1 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
?>
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https://www.php.net/manual/en/function.imageistruecolor.php