https://bugs.kde.org/show_bug.cgi?id=452680
Bug ID: 452680
Summary: Support for IPTC Image-Region tag
Product: digikam
Version: 7.6.0
Platform: unspecified
OS: Unspecified
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: general
Assignee: digikam-bugs-n...@kde.org
Reporter: paul_krause_1...@t-online.de
Target Milestone: ---
SUMMARY
Since 2019 the IPTC standard has an Image Region tag, to define/show general
subregions in an image and store additional metadata for them. Facetags can be
considered a specialization of this idea.
Besides Wikimedia Commons using the same idea for so-called annotations, I
personally find this tag very useful.
It would be nice if Digikam could read, display, and maybe delete these
regions.
Personally I do not mind if the feature to edit, or create, regions is
implemented only later.
ADDITIONAL INFORMATION
I'd guess some code from the faces implementation could be reused. This would
not be completely trivial for the following reasons:
A) Image-regions allow for non-rectangular shapes, which need other code for
drawing them.
B) The need to thumbnail non-rectangular shapes. I'd suggest to either skip
them (by having no dedicated Image Region tab or showing the thumbnail of the
full image) or, preferable, crop to an enclosing rectangle, optionally with
transparency. Enclosing rectangles might need to be discussed for point and
line shapes.
C) Facetags only store one additional tag, the name. Image-regions allow for
more. To get started, one could just show them blindy. For writing one could
allow manipulation only of selected ones, like the name, and copy all others
blindly.
Of course I'm willing to further discuss this topic.
Many Thanks!
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