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Thread: A case of bad posterisation

  1. #1
    Senior Member ErikKaffehr's Avatar
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    A case of bad posterisation

    Hi,

    I found this case of bad posterisation:


    But, using another profile I got this:


    Interestingly, Capture One 8.1 also causes banding, although used with their own profile for the the P45+ back


    An profile I generated with a very old version of Anders Torger's DCamProf had none or very little issues:



    The raw file is here: http://echophoto.dnsalias.net/ekr/Ar...7-CF046278.iiq

    In this case, Adobe Standard Profile in Lightroom produced the best results. Capture One also produced banding artefacts. DCP profiles generated with Color Checker Passport software and Adobe DNG Profile Editor caused banding, but Adobe Standard Profile did not and nor did profiles generated by Anders Torger's DCamProf.

    Just to say, the raw file is a 16-bit raw from a P45+ back.

    Why I posted this on a Sony thread? Just to demonstrate that colour management can cause bad artefacts even on "real" 16 bit files.

    Best regards
    Erik
    Last edited by ErikKaffehr; 22nd August 2015 at 23:33. Reason: Other raw processors included
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  2. #2
    Senior Member ErikKaffehr's Avatar
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    Re: A case of bad posterisation (what is causing it?)

    Hi,

    I looked at the TIFF files in Prophoto RGB using Chromix's Colour Think. What I can see, both my own DNG Profile (that has caused banding) and Adobe Standard DNG (which did not) pushes the colours a bit outside Adobe RGB. But, my DNG profile pushes it quite a bit more!

    So the banding may arise when mapping the colours from the wide Prophoto RGB into the smaller Adobe RGB. This would be very similar to Iliah Borg's comment that colour management contributes most to the artefacts reported by Lloyd Chambers.

    Would there be some interest I can post more details.

    Best regards
    Erik


    Quote Originally Posted by ErikKaffehr View Post
    Hi,

    I found this case of bad posterisation:


    But, using another profile I got this:


    Interestingly, Capture One 8.1 also causes banding, although used with their own profile for the the P45+ back


    An profile I generated with a very old version of Anders Torger's DCamProf had none or very little issues:



    The raw file is here: http://echophoto.dnsalias.net/ekr/Ar...7-CF046278.iiq

    In this case, Adobe Standard Profile in Lightroom produced the best results. Capture One also produced banding artefacts. DCP profiles generated with Color Checker Passport software and Adobe DNG Profile Editor caused banding, but Adobe Standard Profile did not and nor did profiles generated by Anders Torger's DCamProf.

    Just to say, the raw file is a 16-bit raw from a P45+ back.

    Why I posted this on a Sony thread? Just to demonstrate that colour management can cause bad artefacts even on "real" 16 bit files.

    Best regards
    Erik

  3. #3
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    Re: A case of bad posterisation

    Quote Originally Posted by ErikKaffehr View Post
    Hi,

    I found this case of bad posterisation:


    But, using another profile I got this:


    Interestingly, Capture One 8.1 also causes banding, although used with their own profile for the the P45+ back


    An profile I generated with a very old version of Anders Torger's DCamProf had none or very little issues:



    The raw file is here: http://echophoto.dnsalias.net/ekr/Ar...7-CF046278.iiq

    In this case, Adobe Standard Profile in Lightroom produced the best results. Capture One also produced banding artefacts. DCP profiles generated with Color Checker Passport software and Adobe DNG Profile Editor caused banding, but Adobe Standard Profile did not and nor did profiles generated by Anders Torger's DCamProf.

    Just to say, the raw file is a 16-bit raw from a P45+ back.

    Why I posted this on a Sony thread? Just to demonstrate that colour management can cause bad artefacts even on "real" 16 bit files.

    Best regards
    Erik

    Yes - I see this sort of thing quite often and it is very annoying. In my case it was the Sony files in Lightroom that showed horrible banding.

    Here's an example.. Do you think this is worth posting to reinforce that not all posterisation is the camera or colour space?



    Tim

    p.s. quite amazed at large scale structural difference - lightroom almost has a broad scale clarity in it's raw converter!

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