我在互联网上找到了这个代码，一切正常，但我不想调整gif图像的大小，因为当我调整动画gif文件的大小时，会破坏动画。或者，如果很容易调整动画gif图像大小而不丢失动画，
这是upload.php文件
if(isset($_POST))
{
############ Edit settings ##############
$BigImageMaxSize = 500; //Image Maximum height or width
$ThumbPrefix = "thumb_"; //Normal thumb Prefix
$DestinationDirectory = 'uploads/'; //specify upload directory ends with / (slash)
$Quality = 90; //jpeg quality
##########################################
//check if this is an ajax request
if (!isset($_SERVER['HTTP_X_REQUESTED_WITH'])){
die();
}
// check $_FILES['ImageFile'] not empty
if(!isset($_FILES['ImageFile']) || !is_uploaded_file($_FILES['ImageFile']['tmp_name']))
{
die('Something wrong with uploaded file, something missing!'); // output error when above checks fail.
}
// Random number will be added after image name
$RandomNumber = rand(0, 9999999999);
$ImageName = str_replace(' ','-',strtolower($_FILES['ImageFile']['name'])); //get image name
$ImageSize = $_FILES['ImageFile']['size']; // get original image size
$TempSrc = $_FILES['ImageFile']['tmp_name']; // Temp name of image file stored in PHP tmp folder
$ImageType = $_FILES['ImageFile']['type']; //get file type, returns "image/png", image/jpeg, text/plain etc.
//Let's check allowed $ImageType, we use PHP SWITCH statement here
switch(strtolower($ImageType))
{
case 'image/png':
//Create a new image from file
$CreatedImage = imagecreatefrompng($_FILES['ImageFile']['tmp_name']);
break;
case 'image/gif':
$CreatedImage = imagecreatefromgif($_FILES['ImageFile']['tmp_name']);
break;
case 'image/jpeg':
case 'image/pjpeg':
$CreatedImage = imagecreatefromjpeg($_FILES['ImageFile']['tmp_name']);
break;
default:
die('Unsupported File!'); //output error and exit
}
//PHP getimagesize() function returns height/width from image file stored in PHP tmp folder.
//Get first two values from image, width and height.
//list assign svalues to $CurWidth,$CurHeight
list($CurWidth,$CurHeight)=getimagesize($TempSrc);
//Get file extension from Image name, this will be added after random name
$ImageExt = substr($ImageName, strrpos($ImageName, '.'));
$ImageExt = str_replace('.','',$ImageExt);
//remove extension from filename
$ImageName = preg_replace("/\\.[^.\\s]{3,4}$/", "", $ImageName);
//Construct a new name with random number and extension.
$NewImageName = $RandomNumber.'.'.$ImageExt;
//set the Destination Image
$DestRandImageName = $DestinationDirectory.$NewImageName; // Image with destination directory
//Resize image to Specified Size by calling resizeImage function.
if(resizeImage($CurWidth,$CurHeight,$BigImageMaxSize,$DestRandImageName,$CreatedImage,$Quality,$ImageType))
{
//Create a square Thumbnail right after, this time we are using cropImage() function
/*
We have succesfully resized and created thumbnail image
We can now output image to user's browser or store information in the database
*/
echo '<table width="100%" border="0" cellpadding="4" cellspacing="0">';
echo '<tr>';
echo '</tr><tr>';
echo '<td align="center"><img src="uploads/'.$NewImageName.'" alt="Resized Image"></td>';
echo '</tr>';
echo '</table>';
/*
// Insert info into database table!
mysql_query("INSERT INTO myImageTable (ImageName, ThumbName, ImgPath)
VALUES ($DestRandImageName, $thumb_DestRandImageName, 'uploads/')");
*/
}else{
die('Resize Error'); //output error
}
}
// This function will proportionally resize image
function resizeImage($CurWidth,$CurHeight,$MaxSize,$DestFolder,$SrcImage,$Quality,$ImageType)
{
//Check Image size is not 0
if($CurWidth <= 0 || $CurHeight <= 0)
{
return false;
}
//Construct a proportional size of new image
$ImageScale = min($MaxSize/$CurWidth, $MaxSize/$CurHeight);
$NewWidth = ceil($ImageScale*$CurWidth);
$NewHeight = ceil($ImageScale*$CurHeight);
$NewCanves = imagecreatetruecolor($NewWidth, $NewHeight);
//Merci Yves pour la transparence
imagealphablending($NewCanves, false);
imagesavealpha($NewCanves,true);
$transparent = imagecolorallocatealpha($NewCanves, 255, 255, 255, 127);
imagefilledrectangle($NewCanves, 0, 0, $NewWidth, $NewHeight, $transparent);
// Resize Image
if(imagecopyresampled($NewCanves, $SrcImage,0, 0, 0, 0, $NewWidth, $NewHeight, $CurWidth, $CurHeight))
{
switch(strtolower($ImageType))
{
case 'image/png':
imagepng($NewCanves,$DestFolder);
break;
case 'image/gif':
imagegif($NewCanves,$DestFolder);
break;
case 'image/jpeg':
case 'image/pjpeg':
imagejpeg($NewCanves,$DestFolder,$Quality);
break;
default:
return false;
}
//Destroy image, frees memory
if(is_resource($NewCanves)) {imagedestroy($NewCanves);}
return true;
}
}
//This function corps image to create exact square images, no matter what its original size!
function cropImage($CurWidth,$CurHeight,$iSize,$DestFolder,$SrcImage,$Quality,$ImageType)
{
//Check Image size is not 0
if($CurWidth <= 0 || $CurHeight <= 0)
{
return false;
}
//abeautifulsite.net has excellent article about "Cropping an Image to Make Square bit.ly/1gTwXW9
if($CurWidth>$CurHeight)
{
$y_offset = 0;
$x_offset = ($CurWidth - $CurHeight) / 2;
$square_size = $CurWidth - ($x_offset * 2);
}else{
$x_offset = 0;
$y_offset = ($CurHeight - $CurWidth) / 2;
$square_size = $CurHeight - ($y_offset * 2);
}
$NewCanves = imagecreatetruecolor($iSize, $iSize);
if(imagecopyresampled($NewCanves, $SrcImage,0, 0, $x_offset, $y_offset, $iSize, $iSize, $square_size, $square_size))
{
switch(strtolower($ImageType))
{
case 'image/png':
imagepng($NewCanves,$DestFolder);
break;
case 'image/gif':
imagegif($NewCanves,$DestFolder);
break;
case 'image/jpeg':
case 'image/pjpeg':
imagejpeg($NewCanves,$DestFolder,$Quality);
break;
default:
return false;
}
//Destroy image, frees memory
if(is_resource($NewCanves)) {imagedestroy($NewCanves);}
return true;
}
}
非常感谢
答案 0 :(得分：0)
解决方案1：
您可以使用ImageMagick调整gif文件的大小而不会丢失动画：
convert animation.gif -coalesce coalesce.gif
convert -size 128x128 coalesce.gif -resize 96x96 small.gif
要在PHP脚本中执行此操作，请使用system()函数。
解决方案2：
如果您不想调整gif动画的大小，您还可以将第一个切换更改为：
switch(strtolower($ImageType))
{
case 'image/png':
//Create a new image from file
$CreatedImage = imagecreatefrompng($_FILES['ImageFile']['tmp_name']);
break;
case 'image/jpeg':
case 'image/pjpeg':
$CreatedImage = imagecreatefromjpeg($_FILES['ImageFile']['tmp_name']);
break;
case 'image/gif':
$tmp_name = $_FILES['ImageFile']["tmp_name"];
$name = $_FILES['ImageFile']["name"];
move_uploaded_file($tmp_name, "$DestinationDirectory/$name");
break;
default:
die('Unsupported File!'); //output error and exit
}
如果您尝试转换gif图像，这将使您的脚本只是将上传的文件移动到目标文件夹。
如果你这样做，你应该在切换后添加这样的东西，以防止在未设置$CreatedImage的情况下执行其余的代码：
if(isset($CreatedImage)){
// The rest of the code from inside if(isset($_POST)){ ... }
}