php imagecopyresampled 添加黑色背景

Question

我有一个调整大小的图像脚本，它采用 130x81 图像并将其添加到 130x130 图像，当 imagecopyresampled 函数运行时，它会在剩余的空间中添加黑色背景，即使基本图像是白色的。下面的代码，我真的很感激一些帮助。

我试图合并到 php 创建的 130x130 文件中的图像是:

$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

我已经阅读了多个帖子以添加:

imagealphablending($background, false);

进入应该修复它的代码，但它没有任何区别。

提前致谢!

Answer 1

这已经解决了。问题在于 imagecopyresampled 调用的宽度和高度。请参阅下面的代码块:

<?

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
?>