Am 12.03.2013 17:14, schrieb Eildert Groeneveld:
> On So, 2013-03-10 at 11:19 +0100, Ulrich Pegelow wrote:
>> Am 10.03.2013 10:12, schrieb Eildert Groeneveld:
>>> This thread has been quit for some time, but I think there are indeed
>>> issues.
>>> I am running git.
>>> Generally speaking, after correcting exposure for clipping and setting
>>> the black point, I want to do shadows recovery. The starting point is
>>> the slides is 50 with highlights at -50 (radius 100, compress 50%,
>>> shadow col adj 100%, highlights col adj 50%)
>>>
>>> Observations:
>>> 1. when going to 52% the dark parts become lighter as intended
>>> 2. when going to 48% the same seems to happen. Is that correct?
>>> 3. when going back to 50% from either of the above the original
>>> state is definitely NOT reached again. This can be clearly seen
>>> when going back in the history to the step prior to "shadows
>>> and highlight"
>>>
>>> What am I misunderstandin/or else?
>>
>> I fear I don't understand at all. What parameter do you modify here? The
>> "shadows" slider?
> yes, indeed. My steps were as listed above:
> 1. set exposure to remove clipping
> 2. set the black point (both done on the histogram)
> 3. then moved to "Shadows and Highlights" which open sliders starting
> with "Shadows" and "highlights" come second (followed by others)
> 4. when I get there "shadows" slider stands at 50 and "highlights" at
> -50
> 5. when I now move the "shadows up to 52 and higher (like60) the dark
> parts do get lighter. so far so good.
> 6. when I move the slider back to 50 it does get a little darker again
> but ist MUUCH lighter than it was at 4. That should not happen,
> should it?
I cannot confirm your your findings. And it is really strange what you
describe, unless there is something completely broken with your setup.
But even then your findings are really surprising.
darktable, being a non-destructive image editor, behaves completely
different to programs like GIMP. Every editing action in darktable is
just modifying a recipee ("history stack") for image processing. The
history stack applied to the image should always generate the same
result - fully determinstic and reproducible as long as the parameters
stay the same.
Please do the following: after step 4 generate a snapshot (left panel
directly below the navigation window). Then do steps 5 and 6. After that
please activate the snapshot view by clicking on the snapshot name and
compare. You might want to upload a screenshot taken with the snapshot
active, along with your raw file and XMP file to dropbox.com so we can
have a closer look.
Ulrich
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