(PHP 5 >= 5.5.0, PHP 7)
imagepalettetotruecolor — Converts a palette based image to true color
$src
) : boolConverts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
imageAn image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Returns TRUE if the convertion was complete, or if the source image already
is a true color image, otherwise FALSE is returned.
Example #1 Converts any image resource to true color
<?php
// Backwards compatiblity
if(!function_exists('imagepalettetotruecolor'))
{
function imagepalettetotruecolor(&$src)
{
if(imageistruecolor($src))
{
return(true);
}
$dst = imagecreatetruecolor(imagesx($src), imagesy($src));
imagecopy($dst, $src, 0, 0, 0, 0, imagesx($src), imagesy($src));
imagedestroy($src);
$src = $dst;
return(true);
}
}
// Helper closure
$typeof = function() use($im)
{
echo 'typeof($im) = ' . (imageistruecolor($im) ? 'true color' : 'palette'), PHP_EOL;
};
// Create a palette based image
$im = imagecreate(100, 100);
$typeof();
// Convert it to true color
imagepalettetotruecolor($im);
$typeof();
// Free the memory
imagedestroy($im);
?>
The above example will output:
typeof($im) = palette typeof($im) = true color