Php/docs/function.imagepalettetotruecolor
imagepalettetotruecolor
(PHP 5 >= 5.5.0, PHP 7)
imagepalettetotruecolor — Converts a palette based image to true color
说明
imagepalettetotruecolor
( resource $src
) : bool
Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
返回值
Returns true if the convertion was complete, or if the source image already
is a true color image, otherwise false is returned.
范例
Example #1 Converts any image resource to true color
<?php// Backwards compatiblityif(!function_exists('imagepalettetotruecolor')){ function imagepalettetotruecolor(&$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);?>
以上例程会输出：
typeof($im) = palette typeof($im) = true color
