[Digikam-devel] [Bug 205776] "Embedded preview loads full image size" does not only do what it says, confusing users

[Matti Rintala]

https://bugs.kde.org/show_bug.cgi?id=205776





--- Comment #30 from Matti Rintala <bitti cs tut fi>  2009-09-04 12:59:56 ---
I had time to do some quick tests:

The preview list mechanism in libexiv2 seems to work nicely. I wrote a small
program to list sizes of all embedded previews in raw files.

After trying that on raw files from several different cameras, I can say that
my "user group 3" exists, i.e. there are still lots of cameras whose raw file
does not contain a full-size embedded jpeg preview (or at least exiv2 could not
find it). The maximum size of embedded preview differs a lot, for example Sony
A380 seems to store an 1.5 mpix preview even though it's a 18 mpix camera. Old
cameras often stored only the 160x120 exif thumbnail.

So clearly it is not enough to use the embedded preview always when it's
available. In some cameras raw-decoding is the only way to get a full-size (or
even half-size) preview.

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