Tuesday, January 3, 2012
High Pass Sharpening
Try this advanced technique for creative sharpening effects
|This Article Features Photo Zoom|
There are three methods of sharpening in Photoshop that we should all be aware of: Luminance, Edge and High Pass sharpening. In this order, the three methods become progressively more complex and go to greater lengths to reduce the accentuation of noise.
2) Image after low-Radius High Pass sharpening
Follow these steps to apply High Pass sharpening:
1. Duplicate the layer that's to be sharpened.
2. Change the mode of the duplicate layer to Overlay. This is what generates the contrast effect.
3. Filter the duplicate layer and apply the High Pass filter (Filter > Other > High Pass) using a Radius setting that accentuates edge contrast without producing halos. This gives the image layer a gray and linear appearance, concentrating the contrast on contours.
3) Image after high-Radius High Pass sharpening
5. Double-click the layer and use the Blend If sliders to remove the effect from near black and/or near white values. Start by moving the This Layer highlight slider to 235, holding the Option/Alt key and splitting the left side of the slider to 215; finish by moving the This Layer shadow slider to 25, and holding the Option/Alt key, split the right half of the slider to 45.
6. Optionally, reduce the layer's opacity and/or mask it as desired.
High Pass sharpening usually does not require a mask, but masking a High Pass layer can provide sophisticated local control, such as reducing the effect with a gradient mask, which is particularly useful for hybrid sharpening.
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