title: NSImage - after crop PDF is blurry
body: <p>I'm trying to crop a NSImage which contains a PDF. When printing I am using NSImage's drawInRect to have it draw only what I need - and this works great.</p>
  
  <p>But, now instead I'm trying to create a new NSImage of just the cropped area. I played with it for a while, then found this code on CocoaBuilder:</p>
  
  <pre><code>- (NSImage *) imageFromRect: (NSRect) rect
  {
    NSAffineTransform * xform = [NSAffineTransform transform];
  
    // translate reference frame to map rectangle 'rect' into first quadrant
    [xform translateXBy: -rect.origin.x
                    yBy: -rect.origin.y];
  
    NSSize canvas_size = [xform transformSize: rect.size];
  
    NSImage * canvas = [[NSImage alloc] initWithSize: canvas_size];
    [canvas lockFocus];
  
    [xform concat];
  
    // Get NSImageRep of image
    NSImageRep * rep = [self bestRepresentationForDevice: nil];
  
    [rep drawAtPoint: NSZeroPoint];
  
    [canvas unlockFocus];
    return [canvas autorelease];
  }
  </code></pre>
  
  <p>This works, but the returned NSImage is blurry, and no longer suitable for printing. Any ideas?</p>