Re: [darktable-user] Input color profile

[Raymundo Vega]

First, Thank you so much.

I was following the photographylife.com tutorial, but stopped when i tried
the channel mixer to move blue to red and green and set the blue to red
plus green minus blue.

Thanks again, my test photo looks much better now in false color and BW.

~raymundo

"Obscurity is a far greater threat than piracy"
Tim O'Reilly

On Thu, Jun 2, 2016 at 11:29 PM, Robert William Hutton 
wrote:

> IIRC the reason that people play around with custom camera profiles in
> lightroom or photoshop is because their white balance sliders don't go far
> enough to get things into the correct range. There's no such problem in
> darktable, so the process is drastically simpler.
>
> For example, here's a basic process using those Adobe tools that you might
> use as the basis for developing a workflow in darktable:
>
> https://photographylife.com/how-to-process-infrared-photographs
>
> Here's what I've come up with:
>
> Open the channel mixer module.
>
> * Pull down the destination dropdown list, and select blue
> * Right click on the blue slider and type "0"
> * Right click on the red slider and type "1"
>
> You have now put the information from the red channel into the blue
> channel.
>
> * Pull down the destination dropdown list, and select red
> * Right click on the red slider and type "0"
> * Right click on the blue slider and type "1"
>
> You have now put the information from the blue channel into the red
> channel.
>
> Now open the white balance module.  I guess the idea here is to play with
> things until you get what you want, whether that be a white ground and blue
> sky or slightly red ground or whatever.  There's no right or wrong answer.
> One technique that seems to work for me is to use the spot white balance
> and select some foliage, like leaves or grass on the image.  That'll get
> you in the right ballpark.  Then play around with the sliders or try
> selecting different parts of the image until you get the colours that you
> want.  Or try selecting different things within the image with the spot
> white balance tool until it looks good.
>
> Next, you'll probably need to go into the exposure module and play with
> the black and white points, and then you might want to use the equalizer to
> increase the contrast, and then perhaps color zones or color correction
> (again keeping in mind that red and blue have been reversed).
>
> HTH,
>
> Rob
>
>
> On 03/06/16 14:41, Raymundo Vega wrote:
>
>> It may be user ignorance/error, i tried channel mixer playing with values
>> there, but i was not
>> able to swap (for instance) blue and red channels like the color profile
>> bgr do.
>>
>> ~rv
>>
>> "Obscurity is a far greater threat than piracy"
>> Tim O'Reilly
>>
>> On Thu, Jun 2, 2016 at 3:59 AM, Robert William Hutton > > wrote:
>>
>>
>>
>> On 02/06/16 20:52, Tobias Ellinghaus wrote:
>>
>> On Thursday 19 May 2016 10:33:47 Raymundo Vega wrote:
>>
>> Hello all,
>>
>> I am playing with infra red photography and need pointers on
>> how to
>> create icc files, i like to try different channel mixtures.
>>
>>
>> I am not aware of any easy to use editor for ICC profiles. What I
>> personally
>> would do is patching the sources of darktable
>> (src/common/colorspaces.c) to
>> create the profile you want and then have it written to disk. But
>> that requires
>> some basic programming knowledge. Maybe someone else has a better
>> idea?
>>
>>
>> Well, infrared photography generally involves using a really extreme
>> white balance and/or
>> switching the red and blue channels.  Can't you just do that using
>> the white balance and channel
>> mixer modules?  No icc required.  I was going to do a video on it at
>> one point, but having a
>> baby has kinda crimped my free time.
>>
>> Regards,
>>
>> Rob
>>
>>
>> 
>> darktable user mailing list
>> to unsubscribe send a mail to
>> darktable-user+unsubscr...@lists.darktable.org
>> 
>>
>>
>>
> 
> darktable user mailing list
> to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
>
>


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Re: [darktable-user] Input color profile

[johannes hanika]

note that our input colour profile module has a `BGR linear infrared'
profile for this purpose (so you can work on your swapped channels
early on in the pipe, channel mixer comes in quite late).

-jo

On Fri, Jun 3, 2016 at 9:27 AM, Raymundo Vega  wrote:
> First, Thank you so much.
>
> I was following the photographylife.com tutorial, but stopped when i tried
> the channel mixer to move blue to red and green and set the blue to red
> plus green minus blue.
>
> Thanks again, my test photo looks much better now in false color and BW.
>
> ~raymundo
>
> "Obscurity is a far greater threat than piracy"
> Tim O'Reilly
>
> On Thu, Jun 2, 2016 at 11:29 PM, Robert William Hutton 
> wrote:
>>
>> IIRC the reason that people play around with custom camera profiles in
>> lightroom or photoshop is because their white balance sliders don't go far
>> enough to get things into the correct range. There's no such problem in
>> darktable, so the process is drastically simpler.
>>
>> For example, here's a basic process using those Adobe tools that you might
>> use as the basis for developing a workflow in darktable:
>>
>> https://photographylife.com/how-to-process-infrared-photographs
>>
>> Here's what I've come up with:
>>
>> Open the channel mixer module.
>>
>> * Pull down the destination dropdown list, and select blue
>> * Right click on the blue slider and type "0"
>> * Right click on the red slider and type "1"
>>
>> You have now put the information from the red channel into the blue
>> channel.
>>
>> * Pull down the destination dropdown list, and select red
>> * Right click on the red slider and type "0"
>> * Right click on the blue slider and type "1"
>>
>> You have now put the information from the blue channel into the red
>> channel.
>>
>> Now open the white balance module.  I guess the idea here is to play with
>> things until you get what you want, whether that be a white ground and blue
>> sky or slightly red ground or whatever.  There's no right or wrong answer.
>> One technique that seems to work for me is to use the spot white balance and
>> select some foliage, like leaves or grass on the image.  That'll get you in
>> the right ballpark.  Then play around with the sliders or try selecting
>> different parts of the image until you get the colours that you want.  Or
>> try selecting different things within the image with the spot white balance
>> tool until it looks good.
>>
>> Next, you'll probably need to go into the exposure module and play with
>> the black and white points, and then you might want to use the equalizer to
>> increase the contrast, and then perhaps color zones or color correction
>> (again keeping in mind that red and blue have been reversed).
>>
>> HTH,
>>
>> Rob
>>
>>
>> On 03/06/16 14:41, Raymundo Vega wrote:
>>>
>>> It may be user ignorance/error, i tried channel mixer playing with values
>>> there, but i was not
>>> able to swap (for instance) blue and red channels like the color profile
>>> bgr do.
>>>
>>> ~rv
>>>
>>> "Obscurity is a far greater threat than piracy"
>>> Tim O'Reilly
>>>
>>> On Thu, Jun 2, 2016 at 3:59 AM, Robert William Hutton >> > wrote:
>>>
>>>
>>>
>>> On 02/06/16 20:52, Tobias Ellinghaus wrote:
>>>
>>> On Thursday 19 May 2016 10:33:47 Raymundo Vega wrote:
>>>
>>> Hello all,
>>>
>>> I am playing with infra red photography and need pointers on
>>> how to
>>> create icc files, i like to try different channel mixtures.
>>>
>>>
>>> I am not aware of any easy to use editor for ICC profiles. What I
>>> personally
>>> would do is patching the sources of darktable
>>> (src/common/colorspaces.c) to
>>> create the profile you want and then have it written to disk. But
>>> that requires
>>> some basic programming knowledge. Maybe someone else has a better
>>> idea?
>>>
>>>
>>> Well, infrared photography generally involves using a really extreme
>>> white balance and/or
>>> switching the red and blue channels.  Can't you just do that using
>>> the white balance and channel
>>> mixer modules?  No icc required.  I was going to do a video on it at
>>> one point, but having a
>>> baby has kinda crimped my free time.
>>>
>>> Regards,
>>>
>>> Rob
>>>
>>>
>>> 
>>> darktable user mailing list
>>> to unsubscribe send a mail to
>>> darktable-user+unsubscr...@lists.darktable.org
>>> 
>>>
>>>
>>
>> 
>> darktable user mailing list
>> to unsubscribe send a mail to
>> darktable-user+unsubscr...@lists.darktable.org
>>
>
>
> 
> darktable user mailing list to unsubscribe send a mail to
> darktable-user+unsubscr...@lists.darktable.org
__

Re: [darktable-user] Input color profile

[Robert William Hutton]

On 03/06/16 19:23, johannes hanika wrote:

note that our input colour profile module has a `BGR linear infrared'
profile for this purpose (so you can work on your swapped channels
early on in the pipe, channel mixer comes in quite late).


Ooh great I didn't know that (though I feel like I might have known 
once, damn you flawed human memory!), I'll give it a shot. :)


Thanks,

Rob

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Re: [darktable-user] Input color profile

[Tobias Ellinghaus]

On Friday 03 June 2016 16:29:08 Robert William Hutton wrote:
> IIRC the reason that people play around with custom camera profiles in
> lightroom or photoshop is because their white balance sliders don't go far
> enough to get things into the correct range. There's no such problem in
> darktable, so the process is drastically simpler.

One benefit of having that channel mixing in an ICC profile is that you still 
have all the other modules to process your image ontop of those changes. Same 
reason why we have the invert module, you can surely do something similar with 
other modules, too.

That being said, don't we already ship two profiles with flipped channels? BRG 
and the infrared one. Don't they work?

[...]

Tobias

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Re: [darktable-user] Live dvd other than ubuntustudio?

[Tobias Ellinghaus]

On Friday 03 June 2016 08:55:43 Marcial wrote:
> Hello everyone!
> I'm looking for a way of showing DT to a group of students over windows
> machines. I've downloaded Ubuntustudio, but I can't make it work. The
> computers aren't brand new neither powerful, but i think there should be
> no problem apart from speed (I only aim to show the program, not use it
> intensively). I've looked for another live distro that I can use, but
> haven't found any other than that.
> Does anyone know if ther is any other live cd with DT included?

Maybe try the Fedora Design Suit [0], it comes with darktable.

> Thanks

[0] https://labs.fedoraproject.org/design-suite/download/

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[darktable-user] Nikon D3100 not recognised by Darktable - please help!

[Michael Hendry]

Dear Tenebromensals,

I’m using darktable version 2.0.4 (downloaded in .DMG form) on my iMac with OS 
X El Capitan version 10.11.5.

When I connect my Nikon D3100 via USB and click “scan for devices” the camera 
is not detected, although it is detected by other software - e.g. Apple’s 
“Photos” App, Nikon Transfer 2.

Obviously, I can import using one of these programs, and subsequently import 
the images to darktable, but that defeats the object!

Michael


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[darktable-user] Chart Utility

[David Vincent-Jones]

Trying to understand the new Color Checker Lut which uses the 'chart 
utility' ..

Where do I find the utility?

David


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Re: [darktable-user] Nikon D3100 not recognised by Darktable - please help!

[parafin]

see http://www.darktable.org/about/faq/, last entry

> On 03 Jun 2016, at 20:16, Michael Hendry  wrote:
> 
> Dear Tenebromensals,
> 
> I’m using darktable version 2.0.4 (downloaded in .DMG form) on my iMac with 
> OS X El Capitan version 10.11.5.
> 
> When I connect my Nikon D3100 via USB and click “scan for devices” the camera 
> is not detected, although it is detected by other software - e.g. Apple’s 
> “Photos” App, Nikon Transfer 2.
> 
> Obviously, I can import using one of these programs, and subsequently import 
> the images to darktable, but that defeats the object!
> 
> Michael
> 
> 
> darktable user mailing list
> to unsubscribe send a mail to darktable-user+unsubscr...@lists.darktable.org
> 
> 
> 


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