(PHP 5 >= 5.5.0, PHP 7, PHP 8)
imagepalettetotruecolor — Converts a palette based image to true color
Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
imageA GdImage object, 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.
| Version | Description |
|---|---|
| 8.0.0 |
image expects a GdImage
instance now; previously, a valid gd resource was expected.
|
Example #1 Converts any image object to true color
<?php// Backwards compatiblityif(!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);$typeof();// Convert it to true colorimagepalettetotruecolor($im);$typeof();// Free the memoryimagedestroy($im);?>The above example will output:
typeof($im) = palette typeof($im) = true color