imagepalettecopy

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

imagepalettecopy — Copy the palette from one image to another

Description

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

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

Parameters

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

Return Values

No value is returned.

Changelog

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

Examples

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);
?>

Found A Problem?

Learn How To Improve This Page • Submit a Pull Request • Report a Bug

＋add a note

User Contributed Notes 2 notes

down

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 ¶

22 years ago

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

＋add a note