The iphone image taken from the camera automatically rotates -90 degrees

Question

Programmatically, I selected an image from my camera in my application. It was extracted beautifully, but when I switch to another view and reject this view, my image automatically rotates -90 degrees.

and this change only happens the first time after that, when I shift any changes, it means that the image remains at -90 degrees, and this only happens when I recorded the image from the camera. when I get the image from the photo library, the problem was not found.

next image is my original image

and this is a rotated image

I do not know why this change is occurring.

Answer 1

you need to use this function to rotate the image captured by the camera

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingImage:(UIImage *)image editingInfo:(NSDictionary *)editingInfo { image = [self scaleAndRotateImage:image]; [self useImage:image]; [[picker parentViewController] dismissModalViewControllerAnimated:YES]; } - (void)scaleAndRotateImage:(UIImage *)image { int kMaxResolution = 320; // 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 = 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"]; } 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(); [self setRotatedImage:imageCopy]; //return imageCopy; } 

Answer 2

The easiest way to overcome this problem is to scale the image inside the didFinishPickingImage delegate. You can use the following code to scale by importing the " UIImage+ImageScaling.h " class.

theImage =[UIImage imageWithImage:image scaledToSizeWithSameAspectRatio:CGSizeMake(400, 300)]; // for iphone.

Answer 3

This method works for me,

 - (UIImage*) rotateImageAppropriately:(UIImage*)imageToRotate { UIImage* properlyRotatedImage; CGImageRef imageRef = [imageToRotate CGImage]; if (imageToRotate.imageOrientation == 0) { properlyRotatedImage = imageToRotate; } else if (imageToRotate.imageOrientation == 3) { CGSize imgsize = imageToRotate.size; UIGraphicsBeginImageContext(imgsize); [imageToRotate drawInRect:CGRectMake(0.0, 0.0, imgsize.width, imgsize.height)]; properlyRotatedImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } else if (imageToRotate.imageOrientation == 1) { properlyRotatedImage = [UIImage imageWithCGImage:imageRef scale:1.0 orientation:1]; } return properlyRotatedImage; } 

Answer 4

Try this property

@property (nonatomic) CGAffineTransform cameraViewTransform

and rotate from -90 degrees, and then capture the image. If it doesn't work, use the code asked by Cocoa Questions.

Answer 5

If you still need some solution, just send this link where I posted my answer to this problem, just refer to editing and editing 1 also see the last 2 or 3 comments for further links

Answer 6

This is due to the orientation of the image. therefore keep the original orientation of the image. you will get the image orientation in the delegate method of the UIImagePickerController

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 

code example:

 - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImage *sourceImage = [info valueForKey:UIImagePickerControllerOriginalImage]; NSData *data = UIImagePNGRepresentation(sourceImage); UIImage *tmp = [UIImage imageWithData:data]; UIImage *afterFixingOrientation = [UIImage imageWithCGImage:tmp.CGImage scale:sourceImage.scale orientation:sourceImage.imageOrientation]; [self.imagePickerController dismissViewControllerAnimated:YES completion:nil]; }