Hello,

This is related to the thread "Copy settings between modules" and 
related but focused on UI.

Think "Keep the result of that particular auto-compute result" vs 
"Recompute auto for each picture"

One should ask oneself, when doing copy-paste (or apply style):
* you may have applied auto (exposure/white balance/lens correction), be 
happy with the result and want to apply the same *transformation* for 
the other picture(s) (say, +0.55EV, or that precise RGB balance, or that 
fisheye).
* you may mean "re-apply auto-settings independently for each new 
picture" (one will have +0.23EV, one -0.2EV etc).

My suggestion on the user interface side would be :
* in the "keep one-shot auto result" case, uncheck the "auto" checkbox.
* in the "re-apply auto" case, keep the "auto" checkbox checked
(This refers to the auto-exposure UI.)

What I understood from the previous discussions is that the XMP file 
format does not obviously offers a way to represent that distinction.

Refs:
"[Darktable-users] Batch auto exposure 
?":http://sourceforge.net/p/darktable/mailman/message/31712153/

"[Darktable-users] Newbie meets 
styles":http://www.mail-archive.com/[email protected]/msg01640.html

IIRC, some camera firmware (at least Nikon D60) allow to take the white 
balance from a particular past photograph and use it as fixed white 
balance for subsequent shots.  In other words, Nikon engineers took into 
account the two different needs: (1) apply auto once, keep it for next 
cases, vs. (2) apply auto every time.

Hope this helps.

Regards,

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