(PHP 5 >= 5.5.0, PHP 7)
imagepalettetotruecolor — Converts a palette based image to true color
imagepalettetotruecolor ( resource $src ) : bool
Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
image
An image resource, returned by one of the image creation functions, such as imagecreatetruecolor().
Returns true
if the convertion was complete, or if the source image already is a true color image, otherwise false
is returned.
Example #1 Converts any image resource to true color
<?php // Backwards compatiblity if(!function_exists('imagepalettetotruecolor')) { function imagepalettetotruecolor(&$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
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https://www.php.net/manual/en/function.imagepalettetotruecolor.php