如何利用 PHP 中的 imagepalettecopy() 函数将一个图像中的调色板复制到另一个图像中?
imagepalettecopy() 是一个内置 PHP 函数,用于将一个图像中的调色板复制到另一个图像中。此函数将调色板从源图像复制到目标图像。
语法
void imagepalettecopy(resource $destination, resource $source)
参数
imagepalettecopy() 接受两个参数 - $source 和 $destination。
$destination - 指定目标图像资源。
$source - 指定源图像资源。
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返回值
imagepalettecopy() 不返回任何值。
示例 1
<?php // Create two palette images using imagecreate() function. $palette1 = imagecreate(700, 300); $palette2 = imagecreate(700, 300); // Allocate the background to be // gray in the first palette image $gray = imagecolorallocate($palette1, 122, 122, 122); // Copy the palette from image 1 to image 2 imagepalettecopy($palette2, $palette1); // gray color allocated to image 1 without using // imagecolorallocate() twice imagefilledrectangle($palette2, 0, 0, 99, 99, $gray); // Output image to the browser header('Content-type: image/png'); imagepng($palette2); imagedestroy($palette1); imagedestroy($palette2); ?>
输出
示例 2
<?php // Created two palette images using imagecreate() function. $palette1 = imagecreate(500, 200); $palette2 = imagecreate(500, 200); // Create a gray color $gray= imagecolorallocate($palette1, 0, 255, 0); // gray color as the background to palette 1 imagefilledrectangle($palette1, 0, 0, 99, 99, $gray); // Copy the palette from image 1 to image 2 imagepalettecopy($palette2, $palette1); // Get the number of colors in the image $color1 = imagecolorstotal($palette1); $color2 = imagecolorstotal($palette2); echo "Colors in image 1 are " . $color1 . "<br>"; echo "Colors in image 2 is " . $color2; ?>
输出
Colors in image 1 are 1 Colors in image 2 are 1
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