I am working on an application where i am picking up images from iphone library using uiimagepicker control. I am using following code to pick up image.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSLog(#"image picked:");
UIImage *image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
//UIImageWriteToSavedPhotosAlbum(image, self, nil, nil);
CGRect cropRect;
cropRect = [[info valueForKey:#"UIImagePickerControllerCropRect"] CGRectValue];
}
The above method works perfect when I capture an image from camera but when I pick an image from iphone library, the cropRect gives me incorrect values. It is always set to x = 43 or greater, even if I pick the rectangle from extreme left of the screen. So as a result I am getting a vertical black strip on left side of the image.
thanks in advance
Related
I'm attempting to implement an iOS camera view that takes pictures that are square in shape (similar to Instagram). My code appears below. The first part, where the frame height is set to be equal to the frame width, is working as expected and the user is given a view that is square. The problem occurs later when I attempt to apply the frame (which is a CGRect property) to the image data using CGImageCreateWithImageInRect. I pass the frame rect to this method with the image. But the results are not cropped to be square. Instead the image retains the original default dimensions from the iOS camera. Can someone please tell me what I've done wrong? My understanding from the Apple documentation is that CGImageCreateWithImageInRect should select an image area of shape Rect from some starting x/y coordinate. But that doesn't seem to be happening.
//Set the frame size to be square shaped
UIView *view = imagePicker.view;
frame = view.frame;
frame.size.height = frame.size.width;
view.frame = frame;
//Crop the image to the frame dimensions using CGImageCreateWithImageInRect
-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
[self.popoverController dismissPopoverAnimated:true];
NSString *mediaType = [info
objectForKey:UIImagePickerControllerMediaType];
[self dismissModalViewControllerAnimated:YES];
if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
UIImage *image = [info
objectForKey:UIImagePickerControllerOriginalImage];
croppedImage = (__bridge UIImage *)(CGImageCreateWithImageInRect((__bridge CGImageRef)(image), frame));
imageView.image = croppedImage;
}
else if ([mediaType isEqualToString:(NSString *)kUTTypeMovie])
{
// Code here to support video if enabled
}
}
You are doing right. The only thing is that I think you are setting the frame property same as the picker view, so the final size is the same as the original size.
Try to set frame smaller than pickerView.view.frame, not equal
Check this out
Cropping an UIImage
You are setting the frame wrong.
I suggest you take a look at this sample code from Apple, on how to create what you are trying to:
https://developer.apple.com/library/mac/#samplecode/VirtualScanner/Listings/Sources_VirtualScanner_m.html#//apple_ref/doc/uid/DTS40011006-Sources_VirtualScanner_m-DontLinkElementID_9
Look at the:
- (ICAError)startScanningWithParams:(ICD_ScannerStartPB*)pb
function
I am developing a camera application for iphone/ipad.
We are using an overlay for displaying the camera app on top of the viewfinder.
Currently i am trying to save the zoomed image. We are able to zoom the image on viewfinder. But when we save the image it gets saved in the original size.
To solve this we are scaling the zoomed image using the following code :
UIImageView *v = [[UIImageView alloc]initWithImage:image];
UIGraphicsBeginImageContext(v.bounds.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextScaleCTM(context, zoomvalue,zoomvalue);
[v drawRect:CGRectMake(0,0,320,480)];
CGContextRestoreGState(context);
image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Using the above code we are able to get the zoomed image.
However, we need to crop the center portion of the scaled image and save the same. We are not getting the same.
Kindly help
if You are using UIImagePickerController to capture image and zoom your image there then you can get the edited image by getting UIImagePickerControllerEditedImage from picker NSDictionary something like this -
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
img = [[info objectForKey:UIImagePickerControllerEditedImage] retain];
[picker dismissModalViewControllerAnimated:YES];
}
Each time I use the camera to take a photograph, then save it the image is always in landscape. This means the UIImageView in my Xib is the wrong way around. Its Portrait - which is what I want and expected. I can correct this by rotating the image 90 degrees but even then I can't disable the animation which shows the original landscape photo followed by the animated rotation itself. How can I ensure the UIImageView from the camera is actually in portrait mode when saved and not landscape and, how can I disable the animation during the CGAffineTranformationMakeRotation ??
I found this post to be very helpful, it describes adding a category to UIImage to do the rotation of the image before you save it:
http://www.platinumball.net/blog/2009/03/30/iphone-uiimage-rotation-and-mirroring/
And then once the category is implemented, you would do something like this:
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
UIImage *originalImage, *editedImage, *rotatedImage;
editedImage = (UIImage *)[info objectForKey:UIImagePickerControllerEditedImage];
originalImage = (UIImage *)[info objectForKey:UIImagePickerControllerOriginalImage];
if (editedImage)
{
rotatedImage = [editedImage rotate:UIImageOrientationRight];
}
else
{
rotatedImage = [originalImage rotate:UIImageOrientationRight];
}
NSString *f = #"/set/this/to/your/file/name";
[UIImagePNGRepresentation(rotatedImage) writeToFile:f atomically:YES];
[[picker parentViewController] dismissModalViewControllerAnimated:YES];
[picker release];
}
I am working on one module where I need to pick image from photo library and draw on view.but whenever I pick the large scale images it always return me 640 *480 scaled image and because of that small image is displayed.
I have made AllowEditing ON.
can anyone help me to find the resolution of original image,so that I can again scale it to original one.
iImagePicker.allowsImageEditing = YES;
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingImage:(UIImage *)image
editingInfo:(NSDictionary *)editingInfo
{
[[iImagePicker parentViewController] dismissModalViewControllerAnimated:YES];
iIsImageSaved = YES;
iSavedImage = [editingInfo objectForKey:#"UIImagePickerControllerOriginalImage"];;
int width,height;
width = iSavedImage.size.width;
height = iSavedImage.size.height;
iApp->ImagePicked(image);
}
Thanks,
Sagar
You don't need to scale your image back, it should be available anyway. Check my answer to this question (which is a duplicate I think..)
[Updated answer for your code]
You are using a deprecated method, try imagePickerController:didFinishPickingMediaWithInfo: with the UIImagePickerControllerOriginalImage key instead.
Added code snippet:
-(void) imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
UIImage* originalImage = [info objectForKey:UIImagePickerControllerOriginalImage];
NSLog(#"Original image width: %f and height: %f", originalImage.size.width, originalImage.size.height);
UIImage* editedImage = [info objectForKey:UIImagePickerControllerEditedImage];
NSLog(#"Edited image width: %f and height: %f", editedImage.size.width, editedImage.size.height);
[self dismissModalViewControllerAnimated:YES];
}
In my application I m using following codes to crop the captured image :-
-(void)imagePickerController:(UIImagePickerController *) picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
#ifdef _DEBUG
NSLog(#"frmSkinImage-imagePickerController-Start");
#endif
imageView.image = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
//=======================================
UIImage *image =imageView.image;
CGRect cropRect = CGRectMake(100, 100, 125,128);
CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], cropRect);
[imageView setImage:[UIImage imageWithCGImage:imageRef]];
CGImageRelease(imageRef);
//===================================================
//imgglobal = [info objectForKey:#"UIImagePickerControllerOriginalImage"];
// for saving image to photo album
//UIImageWriteToSavedPhotosAlbum(imageView.image, self, #selector(image:didFinishSavingWithError:contextInfo:), self);
[picker dismissModalViewControllerAnimated:YES];
#ifdef _DEBUG
NSLog(#"frmSkinImage-imagePickerController-End");
#endif
}
But my problem is that when I use camera to take photo to crop the captured image it rotates the image to 90 degree towards right and in case I use Photo library it works perfectly.
So can you examine my above code, to see where I am wrong?
The CGImage is a UIImage without the meta data, and therefore loses the orientation information. I'd suggest that you get the orientation of the original [UIImage imageOrientation], store it and then apply it to the final image.
If that doesn't work, try applying a CGAffineTransformMakeRotation(90.0*0.0174532925); to the final image according to the orientation of the original.
Fastest and easiest way is to have a look to NYXImagesKit. With UIImage+Resizing category you can crop image. From the documentation:
UIImage+Resizing
This category can be used to crop or to scale images.
Cropping
You can crop your image by 9 different ways :
Top left Top center Top right Bottom left Bottom center Bottom right
Left center Right center Center
UIImage* cropped = [myImage cropToSize:(CGSize){width, height}
usingMode:NYXCropModeCenter];
NYXCropMode is an enum type which can be found in the header file, it
is used to represent the 9 modes above.