Question

I have this iPhone application that let users take a picture and save it in a database online. My problem is that every time an user take a picture and saves it, the picture results to be in landscape, even though it was taken in portrait mode. This results in having the portrait picture stretched.

This is the code I use when taking a picture:

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    [picker dismissModalViewControllerAnimated:YES];

    NSData *imgData=UIImageJPEGRepresentation([info objectForKey:@"UIImagePickerControllerOriginalImage"],1);
    UIImage *img=[[UIImage alloc] initWithData:imgData];

    if(img.size.width < img.size.height){
        NSLog(@"width < height");
        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 460)];
    }
    else{
        NSLog(@"width > height");
        imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 460, 320)];
    }

    imageView.image = img;
    [img release];
    [[self view] fillPreviewWithImg: imageView];
    [[self view] setImage: imageView.image];
}

Basically what I do is take the picture, create a UIImage, check if it’s portrait or landscape, create the corresponding UIImageView and then set the image into the UIImageView. After that I just call a couple of methods to set up the image in the main view.

I believe the problem with stretching is not bounded to the PHP but to the Objective-C code, but I can’t really see how or why this behavior happens.

Does anyone of you have an idea?

Thanks,

Masiar

Answer 1

Have a look at the imageOrientation property of the UIImage class. You can have an image that is 320 wide and 480 high, but with an orientation of Landscape. This is contained in the EXIF information and it is up to the viewing program to use this orientation information to rotate the image appropriately. Just checking the width and height of the image is not sufficient to know the orientation and this is causing your stretching that you are seeing.