when pixel sharpening is applied?
Answer:
Sharpening enhances the definition of edges in an image. Whether your images come from a digital camera or a scanner, most images can benefit from sharpening. The degree of sharpening needed varies depending on the quality of the digital camera or scanner. Keep in mind that sharpening cannot correct a severely blurred image.
Tips for better sharpening:
Sharpen your image on a separate layer so that you can resharpen it later to output to a different medium.
If you sharpen your image on a separate layer, set the layer’s blending mode to Luminosity to avoid color shifts along edges.
Sharpening increases image contrast. If you find that highlights or shadows are clipped after you sharpen, use the layer blending controls (if you sharpen a separate layer) to prevent sharpening in highlights and shadows. See Specify a tonal range for blending layers.
Reduce image noise before sharpening so that you don’t intensify the noise.
