Rotation of UIImage in iPhone - iphone

Question

I have a problem
When I get an image from iPhone camera. i can get that in all orientations Like LeftLandscape, RightLandscape, Portrait and portrait upside down.
Now how can I rotate the image fetched from Camera Delegates to only one orientation i.e. Only in Portrait OR Landscape Right
Can anybody HElp ?

Answer 1

Try this...
CGSize size = sizeOfImage;
UIGraphicsBeginImageContext(size);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextRotateCTM(ctx, angleInRadians);
CGContextDrawImage(UIGraphicsGetCurrentContext(),
CGRectMake(0,0,size.width, size.height),
image);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
Also refer this link...it will help you out...
http://www.platinumball.net/blog/2009/03/30/iphone-uiimage-rotation-and-mirroring/

Answer 2

NYXImagesKit: Handy UIImage Categories
By Benjamin Godard
This is a handy set of categories on UIImage for rotating, resizing, filtering, enhancing and more, in an efficient and easy-to-use manner. Might be useful in some of your apps!

Answer 3

Try this.It will be helpful
-(UIImage *)resizeImage:(UIImage *)image {
CGImageRef imageRef = [image CGImage];
CGImageAlphaInfo alphaInfo = CGImageGetAlphaInfo(imageRef);
CGColorSpaceRef colorSpaceInfo = CGColorSpaceCreateDeviceRGB();
if (alphaInfo == kCGImageAlphaNone)
alphaInfo = kCGImageAlphaNoneSkipLast;
int width, height;
width = 640;//[image size].width;
height = 640;//[image size].height;
CGContextRef bitmap;
if (image.imageOrientation == UIImageOrientationUp | image.imageOrientation == UIImageOrientationDown) {
bitmap = CGBitmapContextCreate(NULL, width, height, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
} else {
bitmap = CGBitmapContextCreate(NULL, height, width, CGImageGetBitsPerComponent(imageRef), CGImageGetBytesPerRow(imageRef), colorSpaceInfo, alphaInfo);
}
if (image.imageOrientation == UIImageOrientationLeft) {
NSLog(#"image orientation left");
CGContextRotateCTM (bitmap, radians(90));
CGContextTranslateCTM (bitmap, 0, -height);
} else if (image.imageOrientation == UIImageOrientationRight) {
NSLog(#"image orientation right");
CGContextRotateCTM (bitmap, radians(-90));
CGContextTranslateCTM (bitmap, -width, 0);
} else if (image.imageOrientation == UIImageOrientationUp) {
NSLog(#"image orientation up");
} else if (image.imageOrientation == UIImageOrientationDown) {
NSLog(#"image orientation down");
CGContextTranslateCTM (bitmap, width,height);
CGContextRotateCTM (bitmap, radians(-180.));
}
CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);
CGImageRef ref = CGBitmapContextCreateImage(bitmap);
UIImage *result = [UIImage imageWithCGImage:ref];
CGContextRelease(bitmap);
CGImageRelease(ref);
return result;
}