Uploading image on server, receiving rotated image - iphone

Question

In my application I want to upload the image to the server and retrieve the url of uploaded image to display it in the application. I send the NSData of image. Here is my code :
AsynchronousImageView *imgVw_User = (AsynchronousImageView*)[self.view viewWithTag:K_TagImageViewUser];
UIImage *UserImgForBioData = imgVw_User.image;
UserImgForBioData = [UIImage imageWithCGImage:UserImgForBioData.CGImage scale:1.0f orientation:UserImgForBioData.imageOrientation];
NSData *imageData = [NSData dataWithData:UIImageJPEGRepresentation(UserImgForBioData,0.5)];
Base64Transcoder *temp_transcoder=[[Base64Transcoder alloc]init];
NSString * temp_base64EncodedImage= #"";
if (imageData!=nil)
{
temp_base64EncodedImage = [NSString stringWithFormat:#"%#",[temp_transcoder base64EncodedStringfromData:imageData]];
temp_base64EncodedImage = [[temp_base64EncodedImage stringByReplacingOccurrencesOfString:#"\n"
withString:#""]
mutableCopy];
}
Sometime when I display the image, by fetching the url of the image, the image gets rotated. Am I doing something wrong?

Answer 1

If you r capturing Image from Camera then before uploading image generate Image Thumbnail in original orientation by this:
- (UIImage *)generatePhotoThumbnail:(UIImage *)image
{
//int kMaxResolution = 320;
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 = bounds.size.width / ratio;
}
else
{
bounds.size.height = kMaxResolution;
bounds.size.width = 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"];
break;
}
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;
}
after this u get a correct image and then upload that image.
I hope this will solve your issue.
Step1: capture image from camera.
Step2: Generate photoThumbnail by following method
Step3: Then upload the resultant image.
you will get correct image

Answer 2

This worked for me when using images from the the Photo library.
ALAssetRepresentation *rep = [_asset defaultRepresentation];
CGImageRef iref = [rep fullResolutionImage];
UIImage* img = [UIImage imageWithCGImage:iref scale:1.f orientation:UIImageOrientationUp]
Note: _asset is an instance of ALAsset.