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Harald E Brandt
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Highlight Tone Priority as Metadata?

Oct 17, 2008 12:44 AM

In Canons Digital Photo Professional, one can see if the picture was taken with Highlight Tone Priority or not, but in Lightroom one cannot. Is there a way (plugin/hack/...) so that I can get to see this also in Lightroom?
 
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    Oct 17, 2008 6:55 AM   in reply to Harald E Brandt
    No. These tags are proprietary and Canon (nor Nikon for that matter) will tell anybody how they are stored in "their" files.
     
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    Oct 17, 2008 12:24 PM   in reply to Harald E Brandt
    No. How would knowing this information improve your workflow?
     
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    Oct 18, 2008 6:34 AM   in reply to Harald E Brandt
    Does it affect the raw, or is it just an instruction for DPP and for the jpeg that's embedded in the raw file?
     
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    Oct 18, 2008 6:46 AM   in reply to Harald E Brandt
    As far as I know, it only affects the raw data by under-exposing the image. It's the same as -EC. In other words, it's only a change to metering unless you shoot in JPEG.
     
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    Oct 18, 2008 7:19 AM   in reply to Harald E Brandt
    With HTP you are effectively underexposing by 1 stop at the raw level.

    If you are shooting raw there's no point.
     
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    Oct 18, 2008 10:30 AM   in reply to Harald E Brandt
    >First: Is it "pure" exposure compensation? So it is in every aspect equivalent to -1 stop exposure in the camera and then +1 stop exposure in LR?

    The RAW data is really simply underexposed with about a stop. The camera then applies some curves and some exposure compensation to create the jpeg, however nothing happens to the RAW.

    >Second: Nikons Active D-lighting is said to be "similar", but with some differences. Are these two methods exactly the same, or what is the difference?

    Nikon's method is more complex. It actually applies a dynamic range reduction technique (called HDR by some folks) in the camera that is similar to applying some shadow fill and some highlight recovery. This cannot be done by simple curves as the shadows are treated differently than the highlights. At the same time, the RAW data is completely unaffected except for the about 2/3 stop underexposure it applies. This only affects the jpeg preview and it affects what Nikon's capture program would do with the data.
     
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    Oct 18, 2008 1:15 PM   in reply to Harald E Brandt
    As the raw level, HTP drops the ISO by 1 stop and underexposes by 1 stop.
     
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