我正在使用jquery.php插件上传和裁剪图像。除了透明gif/pngs上的黑色背景外，一切都很好。我想保持透明度。我读过其他帖子，意识到以前也出现过这种情况，但不完全理解如何将以前的修复程序应用到我的代码中。
<?php
##########################################################################################################
# IMAGE FUNCTIONS #
# You do not need to alter these functions #
##########################################################################################################
function resizeImage($image,$width,$height,$scale) {
list($imagewidth, $imageheight, $imageType) = getimagesize($image);
$imageType = image_type_to_mime_type($imageType);
$newImageWidth = ceil($width * $scale);
$newImageHeight = ceil($height * $scale);
$newImage = imagecreatetruecolor($newImageWidth,$newImageHeight);
switch($imageType) {
case "image/gif":
$source=imagecreatefromgif($image);
break;
case "image/pjpeg":
case "image/jpeg":
case "image/jpg":
$source=imagecreatefromjpeg($image);
break;
case "image/png":
case "image/x-png":
$source=imagecreatefrompng($image);
break;
}
imagecopyresampled($newImage,$source,0,0,0,0,$newImageWidth,$newImageHeight,$width,$height);
switch($imageType) {
case "image/gif":
imagegif($newImage,$image);
break;
case "image/pjpeg":
case "image/jpeg":
case "image/jpg":
imagejpeg($newImage,$image,90);
break;
case "image/png":
case "image/x-png":
imagepng($newImage,$image);
break;
}
chmod($image, 0777);
return $image;
}
?>
我通过添加取得了进展
imagealphablending($newImage, true);
// Allocate a transparent color and fill the new image with it.
// Without this the image will have a black background instead of being transparent.
$transparent = imagecolorallocatealpha( $newImage, 0, 0, 0, 127 );
imagefill( $newImage, 0, 0, $transparent );
imagesavealpha($newImage,true);
在行$newImage=imagecreatetruecolor（$newImageWidth，$newImageHeight）下方；
它现在适用于pngs，但不适用于gifs？？？