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Thread: Adobe Custom Profiles

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    Administrator Bob's Avatar
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    Adobe Custom Profiles

    I was tipped off by member Jonathan Delacour about Adobe's DNG profile editor, so I thought I would take it out for a spin.
    The following three images are from the same D3 NEF FILE.
    First ACR 4.4
    Attachment 8774
    Next Adobe Profiles Beta 2
    Attachment 8775
    Last, A custom profile made with Adobe DNG Profile Editor
    Attachment 8776
    The custom profile produced markedly better results of a color checker image. It seems that the Adobe profiles were produced with lighting that might have resulted in a bit of specular reflections since I could nearly reproduce the results with more axial lighting.
    -bob

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    Sr. Administrator Jack's Avatar
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    Re: Adobe Custom Profiles

    Bob, care to walk folks through the steps to create the custom profile?
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Re: Adobe Custom Profiles

    must be too much bourbon last night, but my eyes don't see much diff among the pics

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    Administrator Bob's Avatar
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    Re: Adobe Custom Profiles

    Jack,
    There is detailed documentation at the Adobe Labs site at http://labs.adobe.com/wiki/index.php...rofiles:Editor.
    You can start from an existing profile or you can start from a ColorChecker card.
    In my examples I used a ColorChecker illuminated copy-board style with flash.
    The image below shows the differences between the ACR 4.4 profile for the Nikon D3 the the custom profile I produced.
    The image is using both profiles, with the Custom profile revealed in the lower right quadrant of each color square. Note that the grays and flesh tones are very close, but reds and purples have been desaturated in the ACR 4.4 profile.
    Attachment 8777
    -bob

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    Administrator Bob's Avatar
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    Re: Adobe Custom Profiles

    Quote Originally Posted by jlm View Post
    must be too much bourbon last night, but my eyes don't see much diff among the pics
    There is not too much difference except in the reds.
    -bob

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    Sr. Administrator Jack's Avatar
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    Re: Adobe Custom Profiles

    Bob:

    I used to build correction adjustments by hand for ACR shooting a McBeth and then tuning the colors but these were not profiles per se, rather camera-specific per-channel HSL adjustments. They worked well, but the process was arduous.

    By contrast, I understand the new process is somewhat automated? My real question is does it load an actual profile, or is it another camera-specific set of HSL correction adjustments?

    Cheers,
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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    Administrator Bob's Avatar
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    Re: Adobe Custom Profiles

    Jack,
    The Adobe DNG Profile Editor seems to work a little bit like Rag's scripts in its use of a ColorChecker but is lightning fast and far more capable. What it generates is a substitute ACR-style profile that is used instead of the profile sets that come with ACR. I say ACR-style profiles since they are NOT icc profiles per-se, but are color-table based with support for cameras that are sensitive to illuminant changes. It basicly profiles 2850 and 6500 degrees K and interpolates between the two based on the specific image's whitebal seting. I think that it uses the same kind of color table suport technique that a camera can embed in a dng.
    It also has a feature called a recipe. With a recipe, you can base a profile on something you might already be using, then tweak it according to taste, say deep IR whitebal normalization or perhaps some other tweaks designed to produce a "look". That recipe can be saved and then applied to existing profiles for other cameras to generate camera/look specific combinations. That allows one to copy the look across cameras without tweaking each one.
    Pretty cool for the inveterate tweaker!
    -bob

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    Sr. Administrator Jack's Avatar
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    Re: Adobe Custom Profiles

    Thanks Bob, sounds cool!
    Jack
    home: www.getdpi.com

    "Perfection is not attainable. But if we chase perfection, we can catch excellence."

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