从上传的图像创建缩略图 [英] Creating a thumbnail from an uploaded image
问题描述
我想要从用户上传的图片创建缩略图，这样图片看起来不会被压扁。但是也想要原始图像的副本..所以我希望原始图像将原始图像发送到我的服务器并创建一个拇指版本并将其发送到我的服务器，这样我就可以为每个用户调用它们上传自己的图片。
I'm wanting to create a thumbnail from a user uploaded image so the image doesn't look squashed. But also would like a copy of the original image.. So I would like the original image to send the original image to my server and also create a thumb version and send it to my server so I can call each of them for each user that uploads their own image.
我的用户表有2个表
`user_pic` longblob NOT NULL,
`user_pic_small` longblob NOT NULL,
我是没有与编码的图像方面崩溃，但这是我到目前为止。
I'm not crash hot with the image side of coding but this is what I have so far.
Imageupload.php
Imageupload.php
> <form id="myForm" action="include/media.profileimage.upload.php"
> method="POST" enctype="multipart/form-data" target="ifr1">
> <input type = "file" name = "image_data" class = "input_text" style="width:800px;" >
> <input type = "submit" name = "submit" class = "btn_login" value = "Upload">
> </form>
media.profileimage.upload.php
media.profileimage.upload.php
if(isset($_FILES['image_data'])){
if(is_uploaded_file($_FILES['image_data']['tmp_name'])) {
// prepare the image for insertion
$imgData =addslashes (file_get_contents($_FILES['image_data']['tmp_name']));
// get the image info..
$size = getimagesize($_FILES['image_data']['tmp_name']);
// our sql query
$creator_id = $_SESSION['id'];
$sql = "UPDATE users SET user_pic='".$imgData."' WHERE id=$creator_id";
$sql2 = "INSERT INTO userphotos(photo_ownerid,photo_ispublic, photo_name, photo_caption, photo_imagedata) VALUES ($creator_id,1,'Profile Picture','Profile Picture','$imgData')";
// insert the image
if(!mysql_query($sql)) {
echo "Fail. It broke.";
}else{
$c=mysql_query($sql2);
echo "<script> parent.alert('Image Uploaded','',1000);</script>";
}
}
}
非常感谢任何帮助或指导。谢谢你
Would appreciate any help or guidence. Thankyou
推荐答案
更新：
如果你想利用想象（如果它安装在您的服务器上）。注意：我没有使用Imagick的性质 writeFile 因为我在服务器上遇到了问题。文件放置内容同样适用。
If you want to take advantage of Imagick (if it is installed on your server). Note: I didn't use Imagick's nature writeFile because I was having issues with it on my server. File put contents works just as well.
<?php
/**
*
* Generate Thumbnail using Imagick class
*
* @param string $img
* @param string $width
* @param string $height
* @param int $quality
* @return boolean on true
* @throws Exception
* @throws ImagickException
*/
function generateThumbnail($img, $width, $height, $quality = 90)
{
if (is_file($img)) {
$imagick = new Imagick(realpath($img));
$imagick->setImageFormat('jpeg');
$imagick->setImageCompression(Imagick::COMPRESSION_JPEG);
$imagick->setImageCompressionQuality($quality);
$imagick->thumbnailImage($width, $height, false, false);
$filename_no_ext = reset(explode('.', $img));
if (file_put_contents($filename_no_ext . '_thumb' . '.jpg', $imagick) === false) {
throw new Exception("Could not put contents.");
}
return true;
}
else {
throw new Exception("No valid image provided with {$img}.");
}
}
// example usage
try {
generateThumbnail('test.jpg', 100, 50, 65);
}
catch (ImagickException $e) {
echo $e->getMessage();
}
catch (Exception $e) {
echo $e->getMessage();
}
?>
我一直在使用它，只需执行该功能存储原始图像并使用该位置创建缩略图后。根据自己的喜好编辑...
I have been using this, just execute the function after you store the original image and use that location to create the thumbnail. Edit it to your liking...
function makeThumbnails($updir, $img, $id)
{
$thumbnail_width = 134;
$thumbnail_height = 189;
$thumb_beforeword = "thumb";
$arr_image_details = getimagesize("$updir" . $id . '_' . "$img"); // pass id to thumb name
$original_width = $arr_image_details[0];
$original_height = $arr_image_details[1];
if ($original_width > $original_height) {
$new_width = $thumbnail_width;
$new_height = intval($original_height * $new_width / $original_width);
} else {
$new_height = $thumbnail_height;
$new_width = intval($original_width * $new_height / $original_height);
}
$dest_x = intval(($thumbnail_width - $new_width) / 2);
$dest_y = intval(($thumbnail_height - $new_height) / 2);
if ($arr_image_details[2] == IMAGETYPE_GIF) {
$imgt = "ImageGIF";
$imgcreatefrom = "ImageCreateFromGIF";
}
if ($arr_image_details[2] == IMAGETYPE_JPEG) {
$imgt = "ImageJPEG";
$imgcreatefrom = "ImageCreateFromJPEG";
}
if ($arr_image_details[2] == IMAGETYPE_PNG) {
$imgt = "ImagePNG";
$imgcreatefrom = "ImageCreateFromPNG";
}
if ($imgt) {
$old_image = $imgcreatefrom("$updir" . $id . '_' . "$img");
$new_image = imagecreatetruecolor($thumbnail_width, $thumbnail_height);
imagecopyresized($new_image, $old_image, $dest_x, $dest_y, 0, 0, $new_width, $new_height, $original_width, $original_height);
$imgt($new_image, "$updir" . $id . '_' . "$thumb_beforeword" . "$img");
}
}
上述函数创建具有统一缩略图大小的图像。如果图像的尺寸与指定的缩略图尺寸不同（按比例），则顶部和底部只有黑色空间。
The above function creates images with a uniform thumbnail size. If the image doesn't have the same dimensions as the specified thumbnail size (proportionally), it just has blackspace on the top and bottom.
这篇关于从上传的图像创建缩略图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
