imagepalettetotruecolor

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

imagepalettetotruecolor — Converts a palette based image to true color

Descrizione

imagepalettetotruecolor(GdImage $image): bool

Converts a palette based image, created by functions like imagecreate() to a true color image, like imagecreatetruecolor().

Elenco dei parametri

image: Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

Valori restituiti

Returns true if the convertion was complete, or if the source image already is a true color image, otherwise false is returned.

Log delle modifiche

Versione	Descrizione
8.0.0	`image` expects a GdImage instance now; previously, a valid `gd` resource was expected.

Esempi

Example #1 Converts any image object 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

Vedere anche:

imagecreatetruecolor() - Create a new true color image
imageistruecolor() - Finds whether an image is a truecolor image

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User Contributed Notes 3 notes

down

Polda18 ¶

10 years ago


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);

down

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;
    }
}
?>

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-2

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;
    }
}
?>

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