[Digikam-devel] [digikam] [Bug 318351] implement generic marker fields/tags

[Christoph Anton Mitterer]

https://bugs.kde.org/show_bug.cgi?id=318351

--- Comment #3 from Christoph Anton Mitterer <calestyo at scientia.net> ---
I guess http://www.metadataworkinggroup.org/pdf/mwg_guidance.pdf Section 5.9
applies here, further specified in Section C, right?

So you're right, currently there's only Point, Circle and Rectangle...

But IMHO that's quite stupid ;-) ... and it seems the standard could be easily
extended.

Anyway... does digikam already use/conform to MWG?


I just send the following mail to: technical at metadataworkinggroup.com
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Hi.

This originates from[0].

Currently, the specification seems to only allow regions that are made up of a
single(!) area which is either of type Point, Circle or Rectangle.

This is highly limiting in two ways:

1) Only one area might be specified, but in a picture or video it can easily
happen that a given object (say a building) that should be marked with a region
is crossed by some other object (e.g a bridge in the front of it).
So you have two not connected areas which should belong to the same region.

2) Most natural objects won't be rectangles or circles; the specification
should be extended to allow arbitrary polygons to be used as areas.

Note, implementing (1) won't automatically solve (2), because such a polygon
area should IMHO _not_ be defined as a list of the current Point area type -
this would make it impossible to have a list of points (which might also be
reasonable), thus there should be really a separate type.



Cheers,
Chris.

[0] https://bugs.kde.org/show_bug.cgi?id=318351
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