php imagecopyresampled添加黑色背景 [英] php imagecopyresampled adds black background

问题描述

我有一个调整大小的图像脚本，该脚本可以拍摄130x81的图像并将其添加到130x130的图像中，当imagecopyresampled函数运行时，即使基础图像是白色，它也会在剩余的空间中添加黑色背景.在下面的代码中，我非常感谢您的帮助.

I have a resize image script that takes a 130x81 image and adds it to a 130x130 image, when the imagecopyresampled function runs it adds a black background into the space that is left over, even though the base image is white. Code below, I could really appreciate some help.

我要合并到PHP创建的130x130文件中的图像是:

The image I am trying to merge onto the 130x130 file php created is:

$width = 130;
$height = 130;
$filename = 'process-add.jpg'; //130x81px jpg
$this->_image = imagecreatefromjpeg($filename);

$background = imagecreatetruecolor(130,130);//create the background 130x130
$whiteBackground = imagecolorallocate($background, 255, 255, 255); 
imagefill($background,0,0,$whiteBackground); // fill the background with white

imagecopyresampled($background, $this->_image,(130-$width)/2,(130-$height)/2, 0, 0, $width, $height, $width, $height); // copy the image to the background

ImageJpeg ($background,null,100); //display

我已阅读多个帖子以添加:

I have read on multiple posts to add:

imagealphablending($background, false);

插入应该修复它的代码，但是没有任何区别.

into the code which should fix it, but it doesn't make any difference.

提前谢谢！

推荐答案

此问题已解决.问题在于imagecopyresampled调用上的宽度和高度.请参见下面的代码块:

This has been solved. The issue was with teh width and height on the imagecopyresampled call. See the code block below:

<?

ini_set('allow_url_fopen', true);
$filename = 'http://img.yessy.com/1402152287-17201a.jpg'; // 130x81
$image = imagecreatefromjpeg($filename);
list($originalWidth, $originalHeight) = getimagesize($filename);

// Size of image to create
$width = 130;
$height = 130;

$background = imagecreatetruecolor($width, $height);//create the background 130x130
$whiteBackground = imagecolorallocate($background, 255, 255, 255); 
imagefill($background,0,0,$whiteBackground); // fill the background with white

imagecopyresampled($background, $image, 0, ($height - $originalHeight) / 2, 0, 0, $originalWidth, $originalHeight, $originalWidth, $originalHeight); // copy the image to the background

header("Content-type: image/jpeg");
ImageJpeg ($background,null,100); //display
?>

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