2013/8/4 Markus Jung <[email protected]>
> You better read the responses you get here more carefully. It is not the
> first time you participate a discussion about base curve.
Things appear to get worse with later DT versions, and I've read other
people complaints about the base curve recently.
I've given up trying to understand answers that are much too complicate for
an 'ordinary' photographer; I'm not a mathematician, and am just trying to
tell what I observe, from a user point of view, when things don't appear to
be very normal.
I didn't remember having to 'boost' the exposition up to now. It might be
I'm more conscious as I've worked on about 1500 pictures in the past 2
wweks, but I'm surprised I need to do it on every picture.
>
> If you take a look at the gamma function for a gamma value of something
> about 2, you see the darker input values are stretched into the
> brightness, which is what you observe if you turn off the base curve.
> Until the applied base curve contains some offset for the darkest or
> brightest part, the full histogram will be used even if you disable the
> base curve.
>
What I actually see when I deactivate the base curve is a histogram whose
width is reduced, so that the right 1/4 part is totallly empty for every
picture. I don't know what the base curve contains, nor what the gamma is;
I'm just telling what I can see repeatedly on many pictures.
>
> Reminder: The base curve tries to approximate the look of out of camera
> JPEGs. The camera software does not only apply a simple gamma correction
> but also some additional postprocessing which creates the special
> "$vendor_name"-look.
>
.../...
> PS: The histogram your camera shows is derived from the internally
> generated (embedded) JPEG which has some kind of base curve applied like
> i explained above ...
>
I know the histogram is related to the JPEG produced by the camera. But:
1) the 'picture style' I use produces a JPEG as neutral as possible
2) when the JPEG histogram show blown highlights on the camera, I'm
expecting the RAW to have an histogram extending to almost the right side,
and that's not the case in any picture I've been working on recently.
All in all, the result is far from the result I expect, and this result has
nothing to do with the camera produced JPEG, that - for me - serves only as
an indicator at shooting time.
Marie-Noëlle
--
<http://fr.ulule.com/aigoual-aubrac/>
*De l'AIgoual à l'Aubrac, un voyage photographique en Cévennes et Lozère*
Un livre à offrir ou à s'offrir, en souscription jusqu'au 31 août 2013.
Cliquer sur l'image ci-dessus ou ce lien pour en savoir
plus<http://fr.ulule.com/aigoual-aubrac/>
------------------------------------------------------------------------------
Get your SQL database under version control now!
Version control is standard for application code, but databases havent
caught up. So what steps can you take to put your SQL databases under
version control? Why should you start doing it? Read more to find out.
http://pubads.g.doubleclick.net/gampad/clk?id=49501711&iu=/4140/ostg.clktrk
_______________________________________________
Darktable-users mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/darktable-users
