If there was one and one only reason to get Adobe Photoshop CS3, the new sharpening tool in Camera Raw 4.1 would be it.
There are now sliders for Amount, Detail, Radius, and Masking, as well as sliders on the same ‘page’ for luminance and color noise reduction.
The first and most important tip to know is to set the view to 100%. Anything less and you will not be able to see the changes that the sliders make with anything like the detail needed.
At the same time, another tip is to climb down from the 100% mountain after one has made the changes that seem right, and look at the shot at around 25% view, which will give a better impression of what tones look like in ‘normal’ view and will show how sketchy versus how photographic the finished image looks.
To see what the sliders do, I recommend dragging them to the middle position, and then moving individual ones to the left and right in various combinations. The changes that result have to be seen to be appreciated – words could not do them justice.