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Why are Output histograms different from RAW histograms?

Robert Goldstein
I have noticed the the histograms of processed images (TIFF or JPEG) do not resemble those of the underlying RAW images. In particular, the Output image histograms show marked clipping of shadows and highlights. Despite this, the images themselves look identical.

Am I doing something wrong in the processing step? My output colorspace is ProPhoto RGB.

Rob
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  • Drew Altdo
    Rob,
    There are three different histograms at play in Capture One (two really).
    The Exposure Evaluation histogram which shows the true capture of the RAW data.
    The Histogram, which shows an estimate of the RAW data in the current state. Likely after the applied adjustments.
    Finally there is the Histogram of your Processed image.
    If you are referring to the difference between the RAW Histogram and the Processed Image Histogram these differences can simply be attributed to the different formats. A processed image is not a RAW file and therefore they'll always be slightly different.
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  • Robert Goldstein
    [quote="Drew " wrote:
    Rob,
    There are three different histograms at play in Capture One (two really).
    The Exposure Evaluation histogram which shows the true capture of the RAW data.
    The Histogram, which shows an estimate of the RAW data in the current state. Likely after the applied adjustments.
    Finally there is the Histogram of your Processed image.
    If you are referring to the difference between the RAW Histogram and the Processed Image Histogram these differences can simply be attributed to the different formats. A processed image is not a RAW file and therefore they'll always be slightly different.


    Drew,

    I am referring to the differences between the adjusted RAW histogram and the processed Output histogram. I am especially troubled by the clipping of shadows and highlights that sometimes occurs.

    Rob
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  • thowi
    [quote="robgo2" wrote:
    I am referring to the differences between the adjusted RAW histogram and the processed Output histogram. I am especially troubled by the clipping of shadows and highlights that sometimes occurs.
    If the histogram (not the exposure evaluation) in C1 differs from the histogram of the processed TIF there are 2 possible reasons:
    1. the proof profile is not set to "selected recipe"
    2. the image adjustments in C1 contain "clarity" and/or sharpening whereas sharpening is not disabled on output. Clarity and sharpening are not reflected in the histogram (though they are reflected in the exposure warning).
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  • Drew Altdo
    Rob,
    If you're especially concerned, and don't think the differences can be attributed to the two very different formats (RAW and Processed) then create a support case, provide some examples and give us the dirty details of your output recipe. We can look into it further to see if we can explain it better or if it is in fact something to adjust for.
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