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

Matti Rintala bitti at cs.tut.fi
Mon Aug 31 20:32:01 BST 2009


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





--- Comment #10 from Matti Rintala <bitti cs tut fi>  2009-08-31 21:31:55 ---
I only have first-hand experience of Nikon raw files which to my knowledge all
store full-resolution jpg previews. But I think I have read that there are
other cameras where the preview is a thumbnail only. (Nikon have designed NEF
format to contain non-destructive editing information, so full-size preview is
a must-have thing).

But even for Nikon raw files the "quality" of embedded full-size preview
varies. Low-end models use much higher compression than high-end models (to
save space). And raw files edited with Capture NX2 have an extremely high-end
jpg preview (its size can be over 40 % of the raw file size in extreme cases).

To some people the size of the preview may be most important. But if the
compression is high, the quality may be too low to some people in some cases.
So I don't think there's any automatic way to know whether embedded jpg preview
is of acceptable quality to the user.

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