My experience is that sharpening of the full RGB picture can interfere with the colours; this can be avoided by applying the unsharpen filter to the lightness channel only in Lab colour mode. As this requires a lot of mouse clicks I have programmed a function key to switch to Lab mode, select the lightness channel, apply the filter and then revert to RGB mode.
Edwin

Bruce, How about including a review of Nik Sharpener Pro in this article? Where does it replace Unsharp Mask and where does it complement it? Also, look out for typos and missing .JPGs--there are a few in this piece, e.g, figure 2a is incomplete.
Thanks, lad.

Excellent

Would Bruce or anyone else please tell me why fractional radius values are used, since there is no smaller unit than the pixel and we are told to work at output resolution?

This is information that I am currently using and have a need for.

Outstanding feature - useful and clear

I especially liked the clear explanation of spot sharpening techniques. This is a tip that I will use again and again.

I have never quite known what to do with the Unsharp Mask filter and High Pass filter. But now, I know how to use these tools effectively on all or just parts of an image which is extremely helpful.

I am sorry to ask what may be a basic question for anyone who knows photoshop but I am a "traditional/Film" photographer who has been moving to digital (with great satisfaction I may ad) and who is learning the "trade".

In the article Bruce talks of painting the sharpening with a soft-edged brush and I got lost and was hoping that someone may be kind enough to explain.

Otherwise I tried the two pass approach and this is absolutely great combined with unsharpen. I am anxious to try the technique described in "Out of Gamut: (Almost) Everything You Wanted to Know about Sharpening in Photoshop but Were Afraid to Ask".

Thanks,

JT