I recently printed a bunch of A3 prints (42cm on the long side, about 18 inches). I'm using a 40D, so at 300dpi, the images needed to be slightly upscaled in order to fit the A3 size. In photoshop, I simply rescaled the images to 42cm on the long side and printed. While the prints looked quite good, and sharp, I'm wondering if this is the correct resizing process, or if somebody could help out in terms of how I could squeak out a bit more quality. Thanks again.