Att skärpa bilder är det sista du gör
Not exactly right - if you're shooting digital you are most likely using a camera with an anti-aliasing or anti-moiré blur filter over the sensor or a Beyer filter -most DSLR cameras do which create images with some slight blurring due to the color interpolation that creates all three RGB colors from each of the single red, green, or blue color pixels to create a full color image.
Many medium format backs do not use blur filters; multi-shot, scanning backs and Foveon X3 sensors do not need blur filters. The presence and strength of a blur filter will determine how much "capture" sharpening may need to be applied.
That's why almost always there's a need for "Capture Sharpening":
Capture sharpening
The need for capture sharpening depends on the sensor technology, the presence of blur filters, lens quality, and f/stop settings. In general, the best methodology is to accept that any new camera model is likely to have different requirements from any camera model you are currently using. Only testing can tell you how much capture sharpening should be applied. Often, researching forums or camera reports can give you a good idea of starting points.
From:
http://dpbestflow.org/image-editing/sharpening
This article explains sharpening very well and mentions a plug-in - see below - I have been using since it came out something like 8 years ago:
PhotoKit Sharpener Pro
It is a plug in I use every time I process an image - from the beginning of processing the RAW file to getting it ready to print - or send to the web.
You won't believe what a difference it will do to your images until you've used it.
This site:
http://www.luminous-landscape.com/index.shtml
has a LOT of valuable information - like sharpening for example:
http://www.luminous-landscape.com/essays/photokit_sharpener_2.shtml
More valuable information:
Techniques
Tutorials
Understanding Series
Anyway, read the links above and you'll come away with a lot of knowledge how sharpening works - and why you need to use it..=*^)
Cheers,
Christer