Digikam-users Digest, Vol 241, Issue 8

[Steve Franks]

>
>  I am presently using 8.6.0. Is 8.6.0 smart enough to note rotation when
> displaying the image but 8.1.0 was not?  The larger image has the same
> orientation when I look at it in DigiKam (Similarity tab).
>

SF- No, I don’t think that has changed.
>
> For software that rotates images (in this case I assume it was DigiKam
> 8.1.0), is the quality (and size) of the rotated image diminished because
> it had to be uncompressed, rotated, then re-compressed? If so, is it a
> serious degradation or should I not worry about it for JPG photos of
> vacations? If not, why would one be smaller than the other? Is it just the
> way the JPG compression works that portrait images are larger than
> landscape?
>

SF- When software rotates an image it has to unpack the jpeg, rotate the
> image which may lose a few bytes, then recreate the jpeg. The last step
> might use different parameters to the original. Creating JPEG is a lossy
> process, some data is always lost when one is created.
>

Unless you intend to print huge images from your JPEGs the loss of quality
> will normally be invisible. You can check this by opening an image in an
> editor, save it as different files with different jpeg compression. I would
> be surprised if you can see much difference from the original until
> compression is <60%.
>
If you want ultimate quality you need to shoot RAW(NEF) photos.

I don’t know what quality you used to shoot the photos. My Nikon D5300 has
RAW, Fine, Normal and Basic. I usually shoot with RAW+Normal, but I will
experiment with the other options and get back to you.
Steve
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