[Digikam-devel] [Bug 182013] sensitivity is not shown for rw2 files

Gilles Caulier caulier.gilles at gmail.com
Wed Jan 28 08:18:33 GMT 2009


http://bugs.kde.org/show_bug.cgi?id=182013





--- Comment #10 from Gilles Caulier <caulier gilles gmail com>  2009-01-28 09:18:29 ---
0x0002 and 0x0003 according to exiftool are the sensor width and height, while
0x0006 and 0x0007 are Image height and width. 0x0004 is sensor top border,
0x0005 is sensor left border.

Now, for my camera this is as follows:
Exif.Image.0x0002                            Short       1  4060
Exif.Image.0x0003                            Short       1  3016
Exif.Image.0x0004                            Short       1  4
Exif.Image.0x0005                            Short       1  8
Exif.Image.0x0006                            Short       1  3004
Exif.Image.0x0007                            Short       1  4008

I would have assumed that sensor height - 2* top border = image height, but as
you can see the numbers don't add up. The out-of-camera JPEGs are 4000x3000,
which corresponds to (image height - top border) x (image width - left
border). I think now that the tags 0x4 to 0x7 are only hints for the
processing software about how many usable pixels are there. The raw image is
probably the size of the sensor, so I'm tempted to say 0x2 and 0x3 are the
correct raw image size. its then up to the processor to chose a suitable
portion of the sensor area.

regards,
matthias


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