PHP 7.0.6 Released

    imagepalettecopy

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

    imagepalettecopy — Copy the palette from one image to another

    Description

    void imagepalettecopy ( resource $destination , resource $source )

    imagepalettecopy() copies the palette from the source image to the destination image.

    Parameters

    destination

    The destination image resource.

    source

    The source image resource.

    Return Values

    No value is returned.

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

    User Contributed Notes

    buzz at nospam dot oska dot com
    10 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
        }
    }

    ?>
    Los Olvidados
    13 years ago
    To be precise, this function replaces the palette in the destination.
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