//Resize image and keep aspect ratio

-(UIImage *)resizeImage:(UIImage *)image {

int w = image.size.width;

    int h = image.size.height; 

CGImageRef imageRef = [image CGImage];

int width, height;

int destWidth = 640;

int destHeight = 480;

if(w > h){

width = destWidth;

height = h*destWidth/w;

} else {

height = destHeight;

width = w*destHeight/h;

}

CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

 

CGContextRef bitmap;

bitmap = CGBitmapContextCreate(NULL, width, height, 8, 4 * width, colorSpace, kCGImageAlphaPremultipliedFirst);

if (image.imageOrientation == UIImageOrientationLeft) {

CGContextRotateCTM (bitmap, M_PI/2);

CGContextTranslateCTM (bitmap, 0, -height);

} else if (image.imageOrientation == UIImageOrientationRight) {

CGContextRotateCTM (bitmap, -M_PI/2);

CGContextTranslateCTM (bitmap, -width, 0);

} else if (image.imageOrientation == UIImageOrientationUp) {

} else if (image.imageOrientation == UIImageOrientationDown) {

CGContextTranslateCTM (bitmap, width,height);

CGContextRotateCTM (bitmap, -M_PI);

}

CGContextDrawImage(bitmap, CGRectMake(0, 0, width, height), imageRef);

CGImageRef ref = CGBitmapContextCreateImage(bitmap);

UIImage *result = [UIImage imageWithCGImage:ref];

CGContextRelease(bitmap);

CGImageRelease(ref);

return result;

}