Hi Guillermo,

For the sake of science here is the .dng file I was using for both the
DT & LR examples earlier.

https://www.dropbox.com/s/cavd1o7z8r5ao0n/_MG_1496.dng?dl=0

Busy playing with it now paying more attention to the histogram.

Chris

On 2018/04/08 04:17 PM, Robert Bieber wrote:
>
> Don't quote me on this, but since the pixel values are all floats I'm
> pretty sure it's possible for one module to push them beyond the
> "maximum" values and another one to bring them back in with the detail
> still there, as long as everything ends up within the allowable bounds
> by the time it gets converted to int
>
>
> On 04/08/2018 07:11 PM, Guillermo Rozas wrote:
>> Can you provide the original DNG so people can play with it?
>>
>> One think you should take into account is that modules in Darktable
>> are applied in a certain order (bottom to top on darkroom). In
>> particular, "Exposure" and "Base Curve" come before "Shadows and
>> highlights". So, if Exposure pushes the info of the sky past the
>> white point, you can not get it back later (at least that's how I
>> understand it). Going by the histogram, it looks like this is what
>> happening to your picture (there are a lot of pixels close to the
>> right edge): the info was there before the exposure (and base curve)
>> modules, but not by time you get to the shadows and highlights module.
>>
>> Two tips I can give you:
>> - check the RAW over-exposure indicator (small colors icon below and
>> to the right of the picture in darkroom). If the area is really
>> non-recoverable it will show as over exposed in RAW. If not, there is
>> a way to recover it (not always easy, but the info is there)
>> - my first step when editing complex pictures is to use the exposure
>> and black sliders on the Exposure module to fit the data exactly
>> inside the histogram (using the normal under/over exposure
>> indicator). Then I know I'm working with almost all the info the file
>> have.
>>
>> Best regards,
>> Guillermo
>>
>> On Sun, Apr 8, 2018 at 7:04 PM, Peter Cripps <pe...@petercripps.com
>> <mailto:pe...@petercripps.com>> wrote:
>>
>>     I've seen similar results to Chris. One of the (few) things that
>>     I've found Lightroom does better than darktable is highlight
>>     recovery.
>>
>>     I have noticed that the darktable histogram doesn't seem to show
>>     content at the far right hand side that does show in the
>>     Lightroom histogram. Don't know if this is relevant.
>>
>>     I hesitate to mention this, since I'm very conscious of the fact
>>     that darktable is entirely created by people working on their own
>>     time. It seems ungrateful to pick out one thing that isn't
>>     perhaps as good as with other paid programs.
>>
>>     Peter
>>
>>
>>
>>
>>     On 04/08/2018 02:51 PM, Chris wrote:
>>>
>>>     Hi,
>>>
>>>     So the shadows & highlights module also does not seem to full
>>>     'reveal' the detail in the clouds that I know exists... it
>>>     simply darkens the existing pixels that we can already see. So
>>>     not really 'recovering detail' as such.
>>>
>>>     https://www.dropbox.com/s/u3lo4oy9dokdbwh/darkt_04.jpg?dl=0
>>>     <https://www.dropbox.com/s/u3lo4oy9dokdbwh/darkt_04.jpg?dl=0>
>>>
>>>     and pushed further
>>>
>>>     https://www.dropbox.com/s/zih4f434frcxizu/darkt_05.jpg?dl=0
>>>     <https://www.dropbox.com/s/zih4f434frcxizu/darkt_05.jpg?dl=0>
>>>
>>>     obviously I am going to extremes here... but they still just do
>>>     not compare to the clarity revealed from LR.
>>>
>>>     https://www.dropbox.com/s/suw9v3jnsszbsec/lr_02.jpg?dl=0
>>>     <https://www.dropbox.com/s/suw9v3jnsszbsec/lr_02.jpg?dl=0>
>>>
>>>     Thanks,
>>>
>>>     Chris
>>>
>>>
>>>     On 2018/04/08 02:30 PM, Pascal Obry wrote:
>>>>     Le dimanche 08 avril 2018 à 14:25 -0700, Chris a écrit :
>>>>>     Anyway, these are my adventures into highlights in DarkTable.
>>>>     You haven't activate the "shadows & highlight" module, so indeed
>>>>     nothing done for darktable :)
>>>>      
>>>
>>>
>>>     
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>>
>>     
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