问题
Is there a way to rotate a picture with PHP only if it is not correctly positioned after uploaded from iOS?
Some pictures are rotated 90 degrees while others upload correctly.
回答1:
The image is rotating because you are saving the image in JPEG, if you save your image in PNG then the orientation will not change. here is the code to fix orientation issue.
- (UIImage *)fixrotation:(UIImage *)image{
if (image.imageOrientation == UIImageOrientationUp) return image;
CGAffineTransform transform = CGAffineTransformIdentity;
switch (image.imageOrientation) {
case UIImageOrientationDown:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, image.size.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
break;
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, 0, image.size.height);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
case UIImageOrientationUp:
case UIImageOrientationUpMirrored:
break;
}
switch (image.imageOrientation) {
case UIImageOrientationUpMirrored:
case UIImageOrientationDownMirrored:
transform = CGAffineTransformTranslate(transform, image.size.width, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationLeftMirrored:
case UIImageOrientationRightMirrored:
transform = CGAffineTransformTranslate(transform, image.size.height, 0);
transform = CGAffineTransformScale(transform, -1, 1);
break;
case UIImageOrientationUp:
case UIImageOrientationDown:
case UIImageOrientationLeft:
case UIImageOrientationRight:
break;
}
// Now we draw the underlying CGImage into a new context, applying the transform
// calculated above.
CGContextRef ctx = CGBitmapContextCreate(NULL, image.size.width, image.size.height,
CGImageGetBitsPerComponent(image.CGImage), 0,
CGImageGetColorSpace(image.CGImage),
CGImageGetBitmapInfo(image.CGImage));
CGContextConcatCTM(ctx, transform);
switch (image.imageOrientation) {
case UIImageOrientationLeft:
case UIImageOrientationLeftMirrored:
case UIImageOrientationRight:
case UIImageOrientationRightMirrored:
// Grr...
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.height,image.size.width), image.CGImage);
break;
default:
CGContextDrawImage(ctx, CGRectMake(0,0,image.size.width,image.size.height), image.CGImage);
break;
}
// And now we just create a new UIImage from the drawing context
CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
UIImage *img = [UIImage imageWithCGImage:cgimg];
CGContextRelease(ctx);
CGImageRelease(cgimg);
return img;
}
回答2:
Use exif_read_data to find out the orientation of the image:
$exif = exif_read_data('image.jpg');
if (isset($exif['Orientation']))
{
switch ($exif['Orientation'])
{
case 3:
// Need to rotate 180 deg
break;
case 6:
// Need to rotate 90 deg clockwise
break;
case 8:
// Need to rotate 90 deg counter clockwise
break;
}
}
You'll find an explanation of the orientation codes here: http://www.impulseadventure.com/photo/exif-orientation.html
回答3:
I have created a function to correct archived images and you can use this with small modification for the on air correction.
gist link of the function
<?php
/*
Correct image orientation v1.0
Author: Mathuvathanan Mounasamy
Licensed under the MIT license
This function correct all the images' orientation in a given path or directory.
Run: php -r "require 'correctImageOrientation.php'; correctImageOrientation('test/');"
or
php -r "require 'correctImageOrientation.php'; correctImageOrientation('test/test1');"
or
php -r "require 'correctImageOrientation.php'; correctImageOrientation('test');"
*/
function correctImageOrientation($directory) {
$scanned_directory = array_diff(scandir($directory), array('..', '.'));
echo "<pre>";
print_r("scanned directory: \r\n");
print_r($scanned_directory);
echo "</pre>\r\n";
foreach ($scanned_directory as &$file) {
if (is_dir($directory."/".$file)) {
correctImageOrientation($directory."/".$file);
} else {
$filen = explode(".", $file);
$ext = end($filen);
try {
$exif = @exif_read_data($directory."/".$file);
$orientation = $exif['Orientation'];
if (isset($orientation) && $orientation != 1){
switch ($orientation) {
case 3:
$deg = 180;
break;
case 6:
$deg = 270;
break;
case 8:
$deg = 90;
break;
}
if ($deg) {
// If png
if ($ext == "png") {
$img_new = imagecreatefrompng($directory."/".$file);
$img_new = imagerotate($img_new, $deg, 0);
// Save rotated image
imagepng($img_new,$directory.$file);
}else {
$img_new = imagecreatefromjpeg($directory."/".$file);
$img_new = imagerotate($img_new, $deg, 0);
// Save rotated image
imagejpeg($img_new,$directory."/".$file,80);
}
}
echo "<pre>";
print_r("image changed: \r\n");
print_r($directory."/".$file);
echo "</pre>\r\n";
}
} catch (Exception $e) {
echo "error:";
echo $e;
echo "error";
}
}
}
unset($file);
}
?>
回答4:
It doesn't quite answer your question but I always use this script to fix the orientation and scale to a sensible size pre-upload. This way you save hte app user some bandwidth and don't have anything to do server side.
- (UIImage *)scaleAndRotateImage:(UIImage *)image {
int kMaxResolution = 1024; // Or whatever
CGImageRef imgRef = image.CGImage;
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGAffineTransform transform = CGAffineTransformIdentity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = roundf(bounds.size.width / ratio);
}
else {
bounds.size.height = kMaxResolution;
bounds.size.width = roundf(bounds.size.height * ratio);
}
}
CGFloat scaleRatio = bounds.size.width / width;
CGSize imageSize = CGSizeMake(CGImageGetWidth(imgRef), CGImageGetHeight(imgRef));
CGFloat boundHeight;
UIImageOrientation orient = image.imageOrientation;
switch(orient) {
case UIImageOrientationUp: //EXIF = 1
transform = CGAffineTransformIdentity;
break;
case UIImageOrientationUpMirrored: //EXIF = 2
transform = CGAffineTransformMakeTranslation(imageSize.width, 0.0);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
break;
case UIImageOrientationDown: //EXIF = 3
transform = CGAffineTransformMakeTranslation(imageSize.width, imageSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
break;
case UIImageOrientationDownMirrored: //EXIF = 4
transform = CGAffineTransformMakeTranslation(0.0, imageSize.height);
transform = CGAffineTransformScale(transform, 1.0, -1.0);
break;
case UIImageOrientationLeftMirrored: //EXIF = 5
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, imageSize.width);
transform = CGAffineTransformScale(transform, -1.0, 1.0);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationLeft: //EXIF = 6
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(0.0, imageSize.width);
transform = CGAffineTransformRotate(transform, 3.0 * M_PI / 2.0);
break;
case UIImageOrientationRightMirrored: //EXIF = 7
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeScale(-1.0, 1.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
case UIImageOrientationRight: //EXIF = 8
boundHeight = bounds.size.height;
bounds.size.height = bounds.size.width;
bounds.size.width = boundHeight;
transform = CGAffineTransformMakeTranslation(imageSize.height, 0.0);
transform = CGAffineTransformRotate(transform, M_PI / 2.0);
break;
default:
[NSException raise:NSInternalInconsistencyException format:@"Invalid image orientation"];
}
UIGraphicsBeginImageContext(bounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
if (orient == UIImageOrientationRight || orient == UIImageOrientationLeft) {
CGContextScaleCTM(context, -scaleRatio, scaleRatio);
CGContextTranslateCTM(context, -height, 0);
}
else {
CGContextScaleCTM(context, scaleRatio, -scaleRatio);
CGContextTranslateCTM(context, 0, -height);
}
CGContextConcatCTM(context, transform);
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, width, height), imgRef);
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageCopy;
}
回答5:
you can add below script after upload image in folder
$filename = "/files/1.jpg"; /*ADD YOUR FILENAME WITH PATH*/
$exif = exif_read_data($filename);
$ort = $exif['Orientation']; /*STORES ORIENTATION FROM IMAGE */
$ort1 = $ort;
$exif = exif_read_data($filename, 0, true);
if (!empty($ort1))
{
$image = imagecreatefromjpeg($filename);
$ort = $ort1;
switch ($ort) {
case 3:
$image = imagerotate($image, 180, 0);
break;
case 6:
$image = imagerotate($image, -90, 0);
break;
case 8:
$image = imagerotate($image, 90, 0);
break;
}
}
imagejpeg($image,$filename, 90); /*IF FOUND ORIENTATION THEN ROTATE IMAGE IN PERFECT DIMENSION*/
this script works after image will uploaded in folder, so you can add this script after upload file in folder
回答6:
Using the GD Library we can manipulate images in PHP. This script uses the imagerotate () function to rotate a photo. In our case we are rotating it 90 degrees but this can be changed in the script.
<?php
// The file you are rotating
$image = 'myfile.jpg';
//How many degrees you wish to rotate
$degrees = 90;
// This sets the image type to .jpg but can be changed to png or gif
header('Content-type: image/jpeg') ;
// Create the canvas
$source = imagecreatefromjpeg($image) ;
// Rotates the image
$rotate = imagerotate($source, $degrees, 0) ;
// Outputs a jpg image, you could change this to gif or png if needed
imagejpeg($rotate) ;
?>
The most important part of this script, the rotating, is done with the imagerotate() function. The parameters of this function are:
imagerotate (The_image, degrees_to_rotate, background_color, Optional_ignore_transparency)
If the optional ignore transparency is blank or 0, then the transparency is preserved.
array getimagesize ( string $filename [, array &$imageinfo ] )
The getimagesize() function will determine the size of any given image file and return the dimensions along with the file type and a height/width text string to be used inside a normal HTML IMG tag and the correspondant HTTP content type.
You should use this to check how the phone image is oriented so you can know when to call imagerotate().
You can also save the image with imagejpeg. http://www.php.net/manual/en/function.imagejpeg.php
// Save the image as 'path/to/myfile.jpg'
imagejpeg($image, 'path/to/myfile.jpg');
// Free up memory
imagedestroy($image);
回答7:
// File and rotation
$filename = 'test.jpg';
$degrees = 180;
// Content type
header('Content-type: image/jpeg');
// Load
$source = imagecreatefromjpeg($filename);
// Rotate
$rotate = imagerotate($source, $degrees, 0);
// Output
imagejpeg($rotate);
check this link :
http://www.php.net/manual/en/function.imagerotate.php
回答8:
if you are using ImageMagick there is a a very simple fix for it, just add -auto-orient to your command.
convert -auto-orient -quality 90 -resize 1200x800 $f-new
来源：https://stackoverflow.com/questions/22308921/fix-ios-picture-orientation-after-upload-php