A little while ago, somebody stated categorically that images from digital
cameras do not need sharpening. Or that's how I remember it, anyhow.
My experience is the opposite. I have so far only had Olympus digital
cameras, and of these only in the E series.
To use one constant measure, I refer to the sharpening/blur tool in
Faststone Image Viewer. This runs from 0 to + (I have never looked for the
upper limit) to sharpen, and conversely to - (an increasing degree of blur).
When sharpening is applied to a jpeg image, the effect can be seen quite
rapidly, and it is easy to see if any particular image needs 1, 2, 4 or
whatever levels of sharpening, and similarly, but observing the effect on
edges such as a mountain ridgeline, it is easy to see if to much sharpening
has been applied in any particular instance. In my experience, too much
sharpening shows up as a "halo" effect. So, one can undo, and try again.
So I have found that (with cameras on tripods) the E-1 images generally
need +4 degree, and the E-3 & E-510 about +2 or +3; but sometimes
nothing is to be gained by sharpening. Only trial shows this.
As far as resizing in steps with a sharpen after each resize, I think it was CH
Ling who showed me how to do this and demonstrated what there was to
gain, when I was trying to resize this picture for the Olympus Odyssey; just
look at all the lines, and with the wrong technique, they all had massive
jaggies, even though the lines seem to be curved (they are not - just lots of
straight lines).
http://www.reflective-moment.com/olympus-odyssey/bswale/picture4.htm
Brian Swale.
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