[Digikam-devel] [Bug 133880] New: Some physical filters as used with SLR's

[Robert Small]

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http://bugs.kde.org/show_bug.cgi?id=133880         
           Summary: Some physical filters as used with SLR's
           Product: digikamimageplugins
           Version: 0.9.0-beta1
          Platform: Debian testing
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: general
        AssignedTo: digikam-devel kde org
        ReportedBy: SmallR2002 V8d Org


Version:           0.9.0-beta1 (using KDE KDE 3.5.4)
Installed from:    Debian testing/unstable Packages
OS:                Linux

I think it would be nice to be able to use 'physical filters' similar to the ones available from most camera shops. Personally I think the most used would be:
- Polarising
- Warm
- Cold
- UV

I don't think that this should be too hard to do, this is how I would do it using a generic image editor:
1 - Duplicate the basic layer
2 - Desaturate (remove the colours) from the duplicate (which is ABOVE the original)
3 - Colourise the the duplicate*
4 - Make the duplicate opaque (see though) to somewhere between 20% and 70%**
5 - That should produce a nice image which looks like it's had a filter applied.

*  Colourise depending on the filter selected and on some (controllable?) algorithm to work out how strong.
** Default worked out by an algorithm but controllable by the user.

Now, pardon me if I've proposed something really dumb, but, I think it'd be nice and quite enjoyably usable. For those who don't understand about filters:
http://www.jessops.com/Products/SearchResults.aspx?searchword=&CatId=194&cl=1-132-194