Digital Printing 101
There are a couple of things to keep in mind about all printing.
When you are comparing an image from transmitted light (a projected transparency film or a digital image displayed on a monitor) to an image from reflected light (a print), the transmitted image will look more brilliant and have greater dynamic range. Therefore even a "perfect" print will suffer in comparison to a projected image.
Second, the density (darkness) of a print should be varied depending on how much light will be directed toward it. In a relatively dark setting, a lighter print is called for. If viewed under strong light, a denser (darker) print is appropriate. A dark print viewed under strong light will have more brilliance and greater dynamic range than will a light print viewed under dim light.