使用 PHP 将多个 PNG 图像合并为一个 PNG [英] Join multiple PNG Images into a single one PNG using PHP

问题描述

我正在尝试使用 PHP 基于我自己的 PNG 制作自定义精灵，但我遇到了两个问题:

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1. 输出图像是堆叠的 PNG 的集合......换句话说:源 PNG 是相互的.
2. 我需要输出图像的透明背景！

这是我使用的代码:

$width = 210;$高度 = 190;$layers = array();$layers[] = imagecreatefrompng("copy.png");$layers[] = imagecreatefrompng("cut.png");$image = imagecreatetruecolor($width, $height);//使背景透明?imagealphablending($image, false);$transparency = imagecolorallocatealpha($image, 0, 0, 0, 127);imagefill($image, 0, 0, $transparency);imagesavealpha($image, true);imagealphablending($image, true);for ($i = 0; $i < count($layers); $i++) {imagecopy($image, $layers[$i], 0, 0, 0, 0, $width, $height);}imagealphablending($image, false);imagesavealpha($image, true);imagepng($image, 'final_img.png');

解决方案

尝试仅使用 PHP GD 完成工作一小时后，我决定给这个名为ImageWorkshop"的库提供机会，可从此处访问:

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http://phpimageworkshop.com/

结果很棒，我用不到 10 行代码就解决了这个问题.方法如下:

(显然，首先你必须下载ImageWorkshop)

注意:我将使用一些描述性代码以确保每个人都能理解:)

require_once('libs/PHPImageWorkshop/ImageWorkshop.php');/*空层有100x100...而且是透明的！！*/$emptyLayer = ImageWorkshop::initVirginLayer(100, 100);$cut = ImageWorkshop::initFromPath(__DIR__ .'/icons/copy.png');$copy = ImageWorkshop::initFromPath(__DIR__ .'/icons/cut.png');/*设置剪切"和复制"图标在emptyLayer内的位置*/$emptyLayer->addLayerOnTop($cut, 20, 10, 'LT');$emptyLayer->addLayerOnTop($copy, 20, 30, 'LT');//保存结果$dirPath = __DIR__ ."/图标/";$filename = "输出.png";$createFolders = 真；//如果文件夹不存在则创建$backgroundColor = null;//透明，仅适用于 PNG(否则设置为 null 时为白色)$imageQuality = 100;//对 GIF 无用，对 PNG 和 JPEG 有用(0 到 100%)$emptyLayer->save($dirPath, $filename, $createFolders, $backgroundColor, $imageQuality);

仅此而已！

顺便说一下，这个小库使用了 PHP GD 库.

I´m trying to make custom sprites based on my own PNGs using PHP, but I got two problems:

1. Output Image it´s a collection of stacked PNGs... in other words: source PNGs are one over other.
2. I need a transparent background for the output image!

This is the code that I used:

$width = 210;
$height = 190;

$layers = array();
$layers[] = imagecreatefrompng("copy.png");
$layers[] = imagecreatefrompng("cut.png");

$image = imagecreatetruecolor($width, $height);

// to make background transparent?
imagealphablending($image, false);
$transparency = imagecolorallocatealpha($image, 0, 0, 0, 127);
imagefill($image, 0, 0, $transparency);
imagesavealpha($image, true);

imagealphablending($image, true);
for ($i = 0; $i < count($layers); $i++) {
    imagecopy($image, $layers[$i], 0, 0, 0, 0, $width, $height);
}
imagealphablending($image, false);
imagesavealpha($image, true);

imagepng($image, 'final_img.png'); 

解决方案

After one hour trying to do the Job using only PHP GD I decided to give a chance to this Library called "ImageWorkshop" which is accessible from here:

http://phpimageworkshop.com/

The result is AWESOME, with less of 10 lines of code I solve the situation. Here is How:

(Obviously, first you have to download ImageWorkshop)

NOTE: I will use a little bit descriptive code to ensure everybody understanding :)

require_once('libs/PHPImageWorkshop/ImageWorkshop.php');

/*The Empty Layer have 100x100... And is TRANSPARENT!!*/ 
$emptyLayer = ImageWorkshop::initVirginLayer(100, 100); 

$cut = ImageWorkshop::initFromPath(__DIR__ . '/icons/copy.png');
$copy = ImageWorkshop::initFromPath(__DIR__ . '/icons/cut.png');

/*Set the position of "cut" and "copy" icons inside the emptyLayer*/
$emptyLayer->addLayerOnTop($cut, 20, 10, 'LT');
$emptyLayer->addLayerOnTop($copy, 20, 30, 'LT');

// Saving the result
$dirPath = __DIR__ . "/icons/";
$filename = "output.png";
$createFolders = true; //will create the folder if not exist
$backgroundColor = null; // transparent, only for PNG (otherwise it will be white if set null)
$imageQuality = 100; // useless for GIF, usefull for PNG and JPEG (0 to 100%)

$emptyLayer->save($dirPath, $filename, $createFolders, $backgroundColor, $imageQuality);

Thats all!

By the way this small Library uses the PHP GD library.

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