UIImagePickerController返回的图像大于iPhone 4上的预览

Question

I'm taking a photo with UIImagePickerController. Everything works fine on iPad and on iPhone 5. The problem comes with an iPhone4: the photo that I get from the picker is "bigger" than what I saw on the screen when I took the photo.

What do I mean with bigger? I mean that at both sides of the photo, and at the bottom, I see parts of the scene that the camera didn't show when I was taking the photo. This is a problem for my app. I need to capture exactly the same scene that the user sees through the camera when he takes the photo. Not a bigger scene. As I said, on iPhone5 and iPad4 everything works fine. I don't understand this different behaviour. How can I solve this?

PD: I'm not applying any transformation to the image on the picker.

Answer 1

-(void)imagePickerController:(UIImagePickerController*)picker didFinishPickingMediaWithInfo:(NSDictionary*)info
{
    UIImage* originalImage = [info valueForKey:@"UIImagePickerControllerOriginalImage"];
    NSLog(@"Image Size Width %f  Height %f",originalImage.size.width,originalImage.size.height);

    UIGraphicsBeginImageContext(CGSizeMake(320, 480));
    [originalImage drawInRect:CGRectMake(0,0,320,480)];
    UIImage* image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    NSLog(@"image Size h %f  Width %f",[image size].height, [image size].width);

}

Here you can see that What is original image size and after than you can change size as your wish..

Answer 2

It was a problem with the preview on the iPhone4... the preview on the iPhone4 is 16:9, but the final image is 4:3. On the iPhone5 and the iPad, both the preview and the final image are 4:3.

I didn't realize it before because my overlay was hiding part of the preview on the iPhone4, so I thought the preview was 4:3 too (and I think that the preview with iOS6 is 4:3, I'm not sure, I've got to find an iPhone4 with iOS6).

I made my overlay (a UIToolbar) translucent, and now I get what I want.