PHP ver 5.4.24 does not support this function (it has not been defined). To get rid of this, you must copy image resource to new image created by function imagecreatetruecolor();
Example with image loaded from GIF file:
$image = imagecreatefromgif("path/to/gif/file.gif"); //create an image from GIF
$width = imagesx($image); //get width of source image
$height = imagesy($image); //get height of source image
$image2 = imagecreatetruecolor($width,$height); //create new image of true colors with given width and height
imagecopy($image2,$image,0,0,0,0,$width,$height); //copy source image to new one
header("Content-Type: image/jpeg"); //set header for JPG image
imagejpg($image2); //render JPg image into browser
imagedestroy($image); //free up memory
imagedestroy($image2);
imagepalettetotruecolor
(PHP 5 >= 5.5.0, PHP 7)
imagepalettetotruecolor — Converts a palette based image to true color
설명
bool imagepalettetotruecolor
( resource
$src
)Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().
반환값
Returns TRUE if the convertion was complete, or if the source image already
is a true color image, otherwise FALSE is returned.
예제
Example #1 Converts any image resource to true color
<?php
// Backwards compatiblity
if(!function_exists('imagepalettetotruecolor'))
{
function imagepalettetotruecolor(&$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);
?>
위 예제의 출력:
typeof($im) = palette typeof($im) = true color
참고
- imagecreatetruecolor() - Create a new true color image
- imageistruecolor() - Finds whether an image is a truecolor image
add a note
User Contributed Notes 3 notes
Polda18 ¶
10 years ago
walf - iftfy ¶
7 years ago
here the working version of walf's solution
<?php
// Backwards compatiblity
if (!function_exists('imagepalettetotruecolor')) {
function imagepalettetotruecolor(&$src) {
if (imageistruecolor($src)) {
return true;
}
$dst = imagecreatetruecolor(imagesx($src), imagesy($src));
imagealphablending($dst, false);//prevent blending with default black
$transparent = imagecolorallocatealpha($dst, 255, 255, 255, 127);//change the RGB values if you need, but leave alpha at 127
imagefilledrectangle($dst, 0, 0, imagesx($src), imagesy($src), $transparent);//simpler than flood fill
imagealphablending($dst, true);//restore default blending
imagecopy($dst, $src, 0, 0, 0, 0, imagesx($src), imagesy($src));
imagedestroy($src);
$src = $dst;
return true;
}
}
?>
walf ¶
10 years ago
The backwards compatibility example does not preserve transparency. You must first wipe out the default black background on the new image:
<?php
// Backwards compatiblity
if (!function_exists('imagepalettetotruecolor')) {
function imagepalettetotruecolor(&$src) {
if (imageistruecolor($src)) {
return true;
}
$dst = imagecreatetruecolor(imagesx($src), imagesy($src));
imagealphablending($dst, false);//prevent blending with default black
$transparent = imagecolorallocatealpha($new_image, 255, 255, 255, 127);//change the RGB values if you need, but leave alpha at 127
imagefilledrectangle($dst, 0, 0, $imagesx($src), imagesy($src), $transparent);//simpler than flood fill
imagealphablending($dst, true);//restore default blending
imagecopy($dst, $src, 0, 0, 0, 0, imagesx($src), imagesy($src));
imagedestroy($src);
$src = $dst;
return true;
}
}
?>
