130 Chapter11 Sharpening Images in Photoshop Most users of Photoshop will have made use of the Sharpening filters from time to time. I have often met designers who prefer the presets of Sharpen and Sharpen More because they seem to do a reasonable job, whereas they have noticed that the use of Unsharp Mask tends to cause light or dark edges around things. Unfortunately, because our screens are more forgiving than the average printing press, if you see this effect even slightly on screen you can guarantee that it will appear much more pronounced in print. However, if it is used in the right way, Unsharp Mask is an extremely effective sharpening filter. The reason why these edges appear is due to the way in Unsharp Mask OK Cancel Preview