imagepalettecopy

(PHP 4 >= 4.0.1, PHP 5, PHP 7, PHP 8)

imagepalettecopy — Copy the palette from one image to another

Descrizione

imagepalettecopy(GdImage $dst, GdImage $src): void

imagepalettecopy() copies the palette from the src image to the dst image.

Elenco dei parametri

dst: The destination image object.
src: The source image object.

Valori restituiti

Nessun valore viene restituito.

Log delle modifiche

Versione	Descrizione
8.0.0	`dst` and `src` expect GdImage instances now; previously, resources were expected.

Esempi

Example #1 imagepalettecopy() example

<?php
// Create two palette images
$palette1 = imagecreate(100, 100);
$palette2 = imagecreate(100, 100);

// Allocate the background to be 
// green in the first palette image
$green = imagecolorallocate($palette1, 0, 255, 0);

// Copy the palette from image 1 to image 2
imagepalettecopy($palette2, $palette1);

// Since the palette is now copied we can use the 
// green color allocated to image 1 without using 
// imagecolorallocate() twice
imagefilledrectangle($palette2, 0, 0, 99, 99, $green);

// Output image to the browser
header('Content-type: image/png');

imagepng($palette2);
imagedestroy($palette1);
imagedestroy($palette2);
?>

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User Contributed Notes 2 notes

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buzz at nospam dot oska dot com ¶

19 years ago

actually it doesn't "copy" the palette exactly.  It copys the colors from the source palette to the destination image.   the palette you end up with in the destination image will be "same colors different order".   If you want an EXACT palette copy (at the expense of messing up your image if you aren't careful), then use this code: 
<?
// this is a drop-in replacement for imagepalettecopy, except that it make NO attempt to modifiy any of the 
// colors in the dest image, just the palette.   The result?  if you're palette's aren't very similar, the image will look completely different, and likely terrible!
function imagepalettecopy_exact ( $dst_img, $src_img) {
    for( $c = 0 ; $c < imagecolorstotal($src_img); $c++) {
        $col = imagecolorsforindex($src_img,$c);  //get color at index 'c' in the color table
        imagecolorset($dst_img,$c,$col[red],$col[green],$col[blue]); //set color at index 'c' to $col in the $dst_image
    }
}

?>

down

Los Olvidados ¶

21 years ago

To be precise, this function replaces the palette in the destination.

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