imagepalettecopy

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

imagepalettecopy — 将调色板从一个图像复制到另一个

说明

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

imagepalettecopy() 把调色板从 src 图像复制到 dst 图像。

参数

dst: 目标图像对象。
src: 源图像对象。

返回值

没有返回值。

更新日志

版本	说明
8.0.0	`dst` 和 `src` 现在接受 GdImage 实例；之前接受 resource。

示例

示例 #1 imagepalettecopy() 示例

<?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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用户贡献的备注 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
    }
}

?>

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Los Olvidados ¶

21 years ago

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