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Camera Profiles and how to create exact RGB values in DNG Profile Editor or PS.

New Here ,
Sep 11, 2020 Sep 11, 2020

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I need to create several camera profiles where the swatches in a Colorchecker match exact values from a different and non standard source. Is there a way to type specific RGB values into a receipe in DNG Profile Editor such that I can, effectively, make the output source agnostic?

 

So far all I have found is being able to use the HSL slider under any picker value but that isn't giving me the results I need and is taking a long time.

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Community Expert ,
Sep 11, 2020 Sep 11, 2020

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What is the reason for this process? Which light sources are being used? 

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New Here ,
Sep 11, 2020 Sep 11, 2020

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It is an unusual archiving issue, I have scans from a device with an unusual profile and due to logistical limitations I need to replicate the profile of the scans using several different digital camera makes in various locations. Lighting is Solux color proofing bulbs at 5000K.

 

Though truthfully I don't see how that moves towards answering the intial question. Can you create camera profiles by entering in RGB or L*a*b* values to create a profile for one device that 'replicates' the colours and tones of another device.

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Community Expert ,
Sep 12, 2020 Sep 12, 2020

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The reason is your question was general without application.  I want to do this thing, how do I do that specifically. Makes it easy to answer.  There are ways to create camera profiles but without the actual purpose, there's no way to know if it will be the optimal method.  Lots of ways to skin a cat.  

 

To specifically answer your question you can shoot a color checker and build a profile. find out what it returns on those specific 24 colors and then if you don't like the results color correct the original and re-generate the profile.  As I said this is suboptimal in so many many ways that there's no way to know if it will work for your application.  A vague "unusual archiving issue" goes nowhere in explaining the problem you are attempting to solve.  So if you give the above a try and it fails, just describe the actual problem in detail and I'm sure it can be resolved.  

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New Here ,
Sep 12, 2020 Sep 12, 2020

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Bob I appreciate the interest but I'm not actually getting any answers here. My question is relatively straight forwards, do you know a way of putting in specific RGB (or other) values to generate a non standard profile?

 

So far it seems Adobe DNG Profile Editor does not have that functionality, neither does the much more complicated Lumariver Profile Designer. They both have ways of adjusting individual swatches but not  in a way that results in a specified non standard output.

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Community Expert ,
Sep 15, 2020 Sep 15, 2020

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Bob I appreciate the interest but I'm not actually getting any answers here. My question is relatively straight forwards, do you know a way of putting in specific RGB (or other) values to generate a non standard profile?

Tough to understand just what you are attempting.

But, if, rather than "correct values", you require specific (known) values from the captured colorcheker patches to match a previous result, the way to attain this may be to edit the target refererence data text file (that file specifies the actual measured values of the colorchecker target and is used by profile making software as a "reference" for 'correct' appearance, so that a table can be calculated - between captured values and actual physical measured target values.)

 

I hope this helps

thanks
neil barstow, colourmanagement.net :: adobe forum volunteer
[please do not use the reply button on a message within the thread, only use the blue reply button at the top of the page, this maintains the original thread title and chronological order of posts]

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New Here ,
Sep 15, 2020 Sep 15, 2020

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Hi Neil, that's very interesting, so inside the .dcp there is a text file? If so how do I access that? Many thanks, Scott.

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Community Expert ,
Sep 15, 2020 Sep 15, 2020

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The target ref file is used as the aims for the ColorChecker and is used when the profile is built.  If you change the aim values here for each patch and build the profile you can also get to the aims you require.  

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Community Expert ,
Sep 16, 2020 Sep 16, 2020

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Sorry Scott, I've no idea,

the ICC profiling applications I use have reference [text] files in a specific folder. Those refrence files are better if individually measured - some applications use generic target ref. data which is not ideal due to manufacturing tolerances.

basICColor Input SW [which make sgreat "regular" ICC profeiles for use in Photoshop etc.] can also make ".dcp profiles" AFAIK and it uses regular target data [text] files to do that. I could connect you with the developer if you want to run your idea on process past him. [Bias alert, yeah I am a basICColor SW dealer].

I could send you an example target data textfile if it helps you see what would be needed. 

 

If you know the L*a*b* values you need for the colorcheker patches (i.e. the desired captured reults once the profile is assigned) then I'd imagine you would be able to enter them manually.

 

 

I hope this helps

thanks
neil barstow, colourmanagement.net :: adobe forum volunteer
[please do not use the reply button on a message within the thread, only use the blue reply button at the top of the page, this maintains the original thread title and chronological order of posts]

 

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