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scottf26651121
Participant
September 11, 2020
Question

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

  • September 11, 2020
  • 3 replies
  • 667 views

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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    3 replies

    S
    scottf26651121Author
    Participant
    September 15, 2020

    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.

    Bob_Hallam
    Bob_Hallam
    Legend
    September 15, 2020

    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.  

    ICC programmer and developer, Photographer, artist and color management expert, Print standards and process expert.
    NB, colourmanagement
    Community Expert
    NB, colourmanagementCommunity Expert
    Community Expert
    September 15, 2020

    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]

    Bob_Hallam
    Bob_Hallam
    Legend
    September 12, 2020

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

    ICC programmer and developer, Photographer, artist and color management expert, Print standards and process expert.
    S
    scottf26651121Author
    Participant
    September 12, 2020

    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.

    Bob_Hallam
    Bob_Hallam
    Legend
    September 12, 2020

    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.  

    ICC programmer and developer, Photographer, artist and color management expert, Print standards and process expert.
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