Apple Aperture 2 - Manual (Page 459)

Chapter 15 Making Image Adjustments 459
III
Working with the Edge Sharpen Controls
You use the Edge Sharpen controls when you want to sharpen the detail in your image.
The Edge Sharpen controls adjust the luminance values in the image, increasing the
contrast between light and dark pixels that touch, creating an “edge.” Increasing the
contrast between these neighboring light and dark pixels gives the image a crisper, or
sharper, appearance. Images shot with digital image sensors are often a bit soft in focus
because of the demosaic filter applied by the camera’s processor. You also use the Edge
Sharpen controls when you make noise-reduction adjustments, so that the image
retains detail and crisp edges that might otherwise be obscured by the effect of the
noise-reduction adjustment.
Important: The Edge Sharpen controls are not designed to correct images that were
shot out of focus. They are designed to help mitigate the effects of the camera’s
demosaic filter, as well as maintain image detail when noise-reduction adjustments are
applied. Edge Sharpen adjustments can also compensate for the softening that occurs
with some printing processes.
Before Edge Sharpen adjustment After Edge Sharpen adjustment