[Digikam-devel] [Bug 249078] New: digikam should be able to show the available and/or used AF sensors

[Roman Fietze]

https://bugs.kde.org/show_bug.cgi?id=249078

           Summary: digikam should be able to show the available and/or
                    used AF sensors
           Product: digikam
           Version: 1.4.0
          Platform: openSUSE RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: Metadata
        AssignedTo: digikam-devel at kde.org
        ReportedBy: rfkd at fietze-home.de


Version:           1.4.0 (using KDE 4.5.0) 
OS:                Linux

I had a problem with the AF. Currently there's a lot of discussion going on
about bad shots due to not correct working AF, e.g. on Canon's 40D or even 7D,
Most of them are sort of a PEBKAC problem, e.g. using multipoint AF not exactly
knowing what this means for unimportant but closer objects.

So I wanted to know what focus point were actually used for my shots an was
looking for a way to display them somehow on the computer.

My first idea was to write a small script using bash and ImageMagick to create
an image with 19 layers each with a red square containing the AF sensor with
that number, knowing the list of used sensors is in the EXIF data. But then I
detected, that Canon even lists the positions of all AF sensors in (newer
camera's?) EXIF data.

Using exiftool I found the following exntries using a Canon 7D.

AFAreaWidths                    : 222 222 222 222 222 222 222 222 222 222 222
222 222 222 222 222 222 222 222
AFAreaHeights                   : 266 266 266 266 266 266 266 266 266 266 266
266 266 266 266 266 266 266 266
AFAreaXPositions                : -1373 -881 -881 -881 -393 -393 -393 0 0 0 0 0
393 393 393 881 881 881 1373
AFAreaYPositions                : 0 393 0 -393 393 0 -393 743 393 0 -393 -743
393 0 -393 393 0 -393 0
AFPointsInFocus                 : 1,7,8
AFPointsSelected                :
0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18

With that information it will be easy for me, and probably any digikam
programmer, to generate a view of all used/unsused/avaiable AF sensors that can
be turned on as an overly of the currently displayed image, either in the
viewer or editor.

I will test that using transparent gimp layers this evening and double check
the results using test images.


Reproducible: Didn't try

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