i just used it on clouds, i mixed red into gray to get b/w detail in the
clouds back. conditional blending ftw :)
On Sat, Jun 8, 2013 at 8:08 AM, David Vincent-Jones <davi...@frontier.com>wrote:
> It doesn't work on blown clouds of course ... it turns the clouds blue,
> which is not exactly what one would want but if it is a bare sky that is
> blown it works fairly well.
>
> David
>
> On 13-06-07 12:22 PM, johannes hanika wrote:
>
>> wow, that is a surprisingly cool trick, works really well. thanks for the
>> hint (i'm still going to fix the highlights module..).
>>
>> -jo
>>
>>
>> On Sat, Jun 8, 2013 at 4:06 AM, David Vincent-Jones <davi...@frontier.com
>> >wrote:
>>
>> I am noticing that with some blown sky situations if I use a parametric
>>> mask on the magenta area and then use the channel mixer to drop the red
>>> value to that of the green value, some level of the blue sky can often
>>> be recovered.
>>>
>>> David
>>>
>>> On 13-06-07 08:22 AM, Rob Z. Smith wrote:
>>>
>>>> OK, let me substitute 'not quite white' instead of grey.
>>>>
>>>> Imagine what is probably the most frequent use case of blown out areas
>>>>
>>> in clouds. Rather than losing all detail my thoughts are that it might
>>> be
>>> best to do something like map (255,255,255) to white but say
>>> (255,254,243)
>>> to some averaged value such as (254,254,254). That would avoid colour
>>> casts but still avoid throwing away such highlight detail as remains in
>>> the
>>> unblown channels. I think it would look better than a large expanse of
>>> pure white.
>>>
>>>> But retaining colour information would be better provided it doesn't
>>>>
>>> cause colour casts. Raw Therapee have put a lot of work into this but
>>> even
>>> there you still you get colour casts, sometimes. Whenever we invent data
>>> with some interpolation algorithm there is always going to be the odd
>>> example that throws it.
>>>
>>>> I haven't worked on a blown colour casted highlight reconstruction
>>>>
>>> recently, but it strikes me that we can perhaps deal with such colour
>>> casts
>>> more easily in dt than any of the other raw converters. Let's say our
>>> reconstruction causes a typical magenta colour cast in the reconstructed
>>> areas around totally blown highlights - I suspect we could just use our
>>> parametric masks to run a magenta subtracting colour change just on the
>>> brightest pixels and if necessary add a drawn mask as well.
>>>
>>>> -----Original Message-----
>>>> From: Chris Siebenmann [mailto:c...@cs.toronto.edu]
>>>> Sent: 07 June 2013 15:13
>>>> To: Rob Z. Smith
>>>> Cc: darktable-users; c...@cs.toronto.edu
>>>> Subject: Re: [Darktable-users] Best way to recover highlights that are
>>>>
>>> blown in processing?
>>>
>>>> | On 13-06-06 10:14 AM, Chris Siebenmann wrote:
>>>> | > I would be happy to see a highlights reconstruction option for 'if
>>>> | > any channel is clipped, set the pixel to white'. I might even
>>>>
>>> turn
>>>
>>>> | > it on all the time.
>>>> [...]
>>>> |
>>>> | It might be nicer if such an option set the pixel to grey rather than
>>>> | white using the values of the remaining unblown channels to take a
>>>> | best guess at how near to full white that grey should be.
>>>>
>>>> My thinking on this is that white splotches on pictures look less
>>>> ugly
>>>>
>>> than grey splotches. To some extent we are trained (especially now) to
>>> expect very bright areas in pictures to be white; I'm not sure that very
>>> bright areas looking grey instead will look at all pleasent. I wouldn't
>>> be
>>> surprised if they came out looking rather wrong.
>>>
>>>> - cks
>>>>
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