Hi hartwig,
moved the discussion here the section where you posted is for step by step explanations.
Don't have much knowledge about scanning but when you don't have Photoshop there are freeware alternatives:
Gimp
Free open source graphics program very advanced like Photoshop.
Runs on Windows 2000 and above, Mac and Linux.
http://www.gimp.org/
Paint.NET
http://www.getpaint.net/index.html
Small free open source graphics program. (1.6 MB)
Little brother of
Gimp but got some nice features, enough for all your basic and bit more advanced image editing needs.
Runs on Windows XP SP2+/Server 2003 SP1+/Vista
You will need .NET Framework 2.0 but that is probably already installed, if not you can get it at the Windows update website in the Custom updates/Optional section.
http://www.update.microsoft.com/
or on this page:
http://www.microsoft.com/downloads/r...DisplayLang=en
You can download it here:
http://www.getpaint.net/download.html