我正在使用jquery / php插件上传和裁剪图片。除了透明的GIF / pngs上的黑色背景外,一切正常。我想保持透明度。我已阅读其他帖子,并意识到此问题已经出现,但并不完全了解如何将以前的修补程序应用于我的代码。
<?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 $image;
}
?>
答案 0 :(得分:2)
我通过添加
取得了进展 imagealphablending($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);
<$> $ newImage = imagecreatetruecolor($ newImageWidth,$ newImageHeight);
它适用于pngs但不适用于GIF ???