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Issue with ColorChecker Profiles

Kommentare

100 Kommentare

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    @Mike5675

    agree with you,  but I think they primarly addressed with the pro std. profiles what I call the cyan sky syndrome.  the issues in my view is that c1 is very bad in handling high saturate and clipped colors on the core level even before a camera profiles is applied caused by how they calculate WB and exposure. ( also a reason why custom profiles do not work as reliable as with other software ) most c1 user seem accustomed that a visually uniform blue sky falls apart in cyan / blue rendered by c1 but you can see this effect in other high saturated and bright  colors too.  they also reduced the tuning towards what they think is a good skinetone rendering, so less orange and more saturation in brighter tones.  i don't also understand why they do not at least offer one more colormetrical accurate profile with this software, in the past they wanted to keep an advantage for their own cameras but today ? 

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  • dee jjjaaaa

    >  c1 is very bad in handling high saturate and clipped colors on the core level even before a camera profiles is applied

    there are no "colors" before camera profile is applied

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  • dee jjjaaaa

    >  i don't also understand why they do not at least offer one more colormetrical accurate profile with this software

    does adobe, for example, offer "reproduction" profiles ? no ...  and if not "reproduction" then what is "more colormetrical accurate" camera profile ?  is it going to pay their bills ? 

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    @ dee jjjaaaa

    there are no "colors" before camera profile is applied

    this is wrong !  camera icc profiles like used in c1 can not be applied to the raw data but only to an already rendered file.  adobe saw this as a problem and developed the dng profile as solution which is applied early in the processing.

    does adobe, for example, offer "reproduction" profiles ?

    no but for general photography reproduction profiles make no sense.  

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  • Denis Mortell

    You are correct.

    There seems to be a view at large that a reproduction profile will somehow produce perfect colours.

    A reproduction profile is exactly as the term states; it is a profile used for reproduction (usually of artwork or products with known colours) under a known ligthsource, usually 5000 kelvin.

    Applied to other lightsources, e.g. morning or evening sunshine, it could look totally off.

    The whole point of a reproduction profile is that it is repeatable under the agreed lightsource. Nothing more.

    D.

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  • ---

    yes and this is probably one of the real reasons why they "hand tune"  their profiles - to make them usable under different light sources which is in fact a big compromise but cheaper than to offer a set of profiles as they do for their cameras. 

    when you shoot under mixed and artificial light ( color led ! )  the c1 color rendering approach shows a clear disadvantage and this is unfortunately not fixable with profiling. 

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  • Denis Mortell

    The camera profile is a response to the colour temperature at the time of the photograph.

    It has to be all things to all photographs.

    Repro profiles are simply controllable and repeatable. They have zip to do with general photography.

     

    D.

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  • ---

    maybe I was not clear enough I think a hue shift in bright and high saturated colors happens before the profile is applied. c1 is very secretive on its color handling which is not good btw.

    for example when you extract the no color management .icc  profile from a file intended to build a profile and compare it to other rgb spaces it is very close to colormatc RGB.  I don't understand it, can someone else explain why they even embed such a profile ?  

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  • Dan Stanfield

    Just thought I might add to this as I have been playing around with it myself and the issue does not seem to be resolved. I have found what I think to be a decent way of fixing the 'no true blacks' issue. This may just be a band-aid fix but it has been working well for me so far.

    If you can't get true blacks even when clipping them with levels and curves. Try using the Color Balance wheel instead. Go to the Shadow Tab and pull the Lightness bar on the right down a little. I can get the X-rite profile image to look very close to the standard profile image by doing this. The contrast is fixed without touching anything else and I am also getting 0,0,0,0 Blacks.

    Another tip while doing this, is to compare the standard profile image with the X-rite profile image side by side to match the blacks. once you are happy with it, save the color balance wheel as a preset so you can quickly fix it each time. It seems to be consistent for me.

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  • ninjatune

    Dan Stanfield this is a great tip, and it definitely gets the blacks to match the non calibrated shot. Thanks for solving this issue!

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