[Digikam-devel] [Bug 297804] Saving an image loses portait orientation

[Matti Rintala]

https://bugs.kde.org/show_bug.cgi?id=297804

--- Comment #12 from Matti Rintala <bitti at cs.tut.fi> ---
I understand your concern about backwards compatability.

But about "we treat rotation like all other metadata": there's metadata and
then there's metadata. Most metadata is data *about* the image (shutter speed,
date, gps, etc) and is not needed for interpreting the image itself. Then
there's metadata that's not "meta" in the strict sense but is needed for
correctly rendering the image. Image orientation belongs to this group, but so
does at least icc profile (I can't list any others from the top of my head).
This metadata needs to be correct to actually show the image.

If such essential metadata changes when the image itself is changed, digikam
definitely *should* update the metadata as well, otherwise updating the image
itself is pointless. If I edit a jpeg and change its color space from sRGB to
ProPhotoRGB, the result would be catastrophic if digikam would still render the
edited image as sRGB. The same applies to orientation. The only difference
there is that digikam allows changing the orientation without actually
"editing" the image and without updating the image file.

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