CGImageCreateWithImageInRect with MZCroppableView rect issue - ios

Question

I am using this library to crop image form appropriate path.
Seems it works perfect, but after modification the image has another size, that I can't understand how to control.
I have added image with the same size as a container. Sizes = 320 x 524
There is an method in the sources that return cropping image:
- (UIImage *)deleteBackgroundOfImage:(UIImageView *)image
{
NSArray *points = [self.croppingPath points];
CGRect rect = CGRectZero;
rect.size = image.image.size;
UIBezierPath *aPath;
UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0);
{
[[UIColor blackColor] setFill];
UIRectFill(rect);
[[UIColor whiteColor] setFill];
aPath = [UIBezierPath bezierPath];
// Set the starting point of the shape.
CGPoint p1 = [MZCroppableView convertCGPoint:[[points objectAtIndex:0] CGPointValue] fromRect1:image.frame.size toRect2:image.image.size];
[aPath moveToPoint:CGPointMake(p1.x, p1.y)];
for (uint i=1; i<points.count; i++)
{
CGPoint p = [MZCroppableView convertCGPoint:[[points objectAtIndex:i] CGPointValue] fromRect1:image.frame.size toRect2:image.image.size];
[aPath addLineToPoint:CGPointMake(p.x, p.y)];
}
[aPath closePath];
[aPath fill];
}
UIImage *mask = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0.0);
{
CGContextClipToMask(UIGraphicsGetCurrentContext(), rect, mask.CGImage);
[image.image drawAtPoint:CGPointZero];
}
UIImage *maskedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect croppedRect = aPath.bounds;
croppedRect.origin.y = rect.size.height - CGRectGetMaxY(aPath.bounds);//This because mask become inverse of the actual image;
croppedRect.origin.x = croppedRect.origin.x*2;
croppedRect.origin.y = croppedRect.origin.y*2;
croppedRect.size.width = croppedRect.size.width*2;
croppedRect.size.height = croppedRect.size.height*2;
CGImageRef imageRef = CGImageCreateWithImageInRect(maskedImage.CGImage, croppedRect);
maskedImage = [UIImage imageWithCGImage:imageRef];
return maskedImage;
}
When I debug maskedImage before maskedImage = [UIImage imageWithCGImage:imageRef]; line it seems the method remove background correct, but by some reason after the method CGImageCreateWithImageInRect(maskedImage.CGImage, croppedRect); modify frame of cropped image. I tried to set cropped rect manually in CGImageCreateWithImageInRect to crop just needed frame.
CGImageRef imageRef = CGImageCreateWithImageInRect(maskedImage.CGImage, CGRectMake(0, 0, 320, 100));
But it return nothing for me.
How can I extract appropriate rect?
Also this lines multiply rect x2:
croppedRect.origin.x = croppedRect.origin.x*2;
croppedRect.origin.y = croppedRect.origin.y*2;
croppedRect.size.width = croppedRect.size.width*2;
croppedRect.size.height = croppedRect.size.height*2;
So when I debug it:
origin=(x=242, y=874) size=(width=191, height=164)
So as you can see the Y point out of my image height size 524, but by some reason it works.