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Import Adobe or Nikon curves?

wnl1
The Fotogenetic web site has a few exposure curves designed specifically for the D70 and D100. These curves are highly recommended by lots of folks, and the guy that designed them spent quite a bit of time testing and tweaking them. These are known as the "point and shoot" (formerly "white wedding") and EV3 curves. I would like to try them out. Problem is, these curves are only available as Nikon (.ncv) or Adobe (.acv) curve files. He has graphs that show the data points, and I recently attempted to reproduce one of the curves in the Capture One LE curve editor. For anyone who has tried to use that tool in a precise manner, you will understand when I say that I was underwhelmed by the interface.

Is there any way to import .acv or .ncv files or otherwise convert them to .crv files? Or is there a better way to hand-edit the curve in C1? It's only 5 points, but it is very hard to be precise with that tool.

Thanks!
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  • Remmelt
    Hi,

    The curves subject is a popular subject. You should do a search on the Nikon D70s forum on Dpreview.com. Here's my take:
    The curves you mention are in camera curves. Meaning that they are applied to the RAW data in the camera. So if you shoot JPEG the curve will be applied, but when shooting RAW and when using Capture One the curve is lost. If you would like to reproduce the curve to a curve you can apply in Capture One you should convert the curve you want (f.e. Whitewedding) to an editor-curve (the difference between the two is the scale. An editor curve is logarithmic and the in camera curve is linear). There's software available for this to do so and that can be found here http://home.tiscali.dk/mhj/Foto/TupConverterDoc.html.

    I used is to convert the slight S-curve I almost always use in C1LE to convert that to an in camera curve.

    Remmelt
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  • wnl1
    Thanks for the info! I never knew there was a difference between camera curves and editor curves. But now that I've read about it that makes sense.

    However, according to the software's webpage: "The program will only work with tone curves stored in ToneUp's special TUP format.". Unless there is a utility to convert TUP to a .crv file I am still stuck. C1LE will only read .crv files.

    I have looked in the dpreview archive but I did not find anything specific to this issue.
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  • Remmelt
    Hi,

    Once you've chosen the curve you want you can take some XY-readings (that is write down the curve in a graph and note some characteristic points). With this this info you can create the curve in Capture One and save it there. Be aware that some are in percentages and some ar in absolute values ranging form 0 - 255.

    Good luck.

    Remmelt
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  • wnl1
    [quote="Remmelt" wrote:

    Once you've chosen the curve you want you can take some XY-readings (that is write down the curve in a graph and note some characteristic points). With this this info you can create the curve in Capture One and save it there.
    Remmelt


    I've already tried that! (see original post) But the curve editor isn't precise enough to duplicate the curve exactly, or even closely.
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  • Remmelt
    Hi,

    Sorry, forgot that. Did you use the shift-key ? It makes subtle changes more easy. And BTW why do you need that exact presision ? It seems good enough to me, or am I missing something.

    Remmelt
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  • Photographicon
    Alan Pacheco has written an experimental Gradation Curve Editor (C1CPE) that allows direct entry of numerical values - see .

    In the light of this discussion maybe someone could describe the essential difference between Film Curves ('.fcrv' files) and Exposure Curves ('.crv' files)...
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  • wnl1
    [quote="Remmelt" wrote:

    Sorry, forgot that. Did you use the shift-key ? It makes subtle changes more easy. And BTW why do you need that exact presision ? It seems good enough to me, or am I missing something.
    Remmelt


    I've tried using the shift key and I still find the editor pretty clumsy to use. I don't really know how precise I have to be, but I do know that the guy who publishes the curves has meticulously tweaked and tested them. He seems to have produced something that is very precise and I would like to render it as closely as possible to what his testing indicates as good.

    Of course now I've learned that I can't use that curve directly as it is a camera curve, not an editing curve.
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