(PHP 5 >= 5.5.0)
imagepalettetotruecolor — Converts a palette based image to true color
$src
)Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
imageUna risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().
Returns TRUE if the convertion was complete, or if the source image already
is a true color image, otherwise FALSE is returned.
Example #1 Converts any image resource to true color
<?php
// Backwards compatiblity
if(!function_exists('imagepalettetotruecolor'))
{
function imagepalettetotruecolor(&$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);
?>
Il precedente esempio visualizzerà:
typeof($im) = palette typeof($im) = true color