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Download D100 custom tones here: corrects underexposure

fotogenetic


63 posts

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"I tried the JLMcurve"

fotogenetic Registered since 25th Nov 2002
Wed 16-Jan-08 01:07 PM

I tried out this curve originally and found that it indeed boosts low tones, however, the midtones from some of my shots (specifically, the brown spots on geese)lacked contrast. You really have to understand what the different concavities along a tone curve correllate to when you create custom tone curves. I've attached a comparison of the different curves.

The black dots indicate the waypoints on my curve while the red dots indicate the waypoints on the JLMcurve. One thing I've noticed about the JLMcurve that I do like and want to try and change on my own curve is how the midtones are darker. This has the effect of making skies look deeper. For now, I use a circular polarizer to create this effect. I haven't been able to find a way to create the same effect while maintaining contrast and brightening low-mid tones.
http://genji.image.pbase.com/u17/atmabini/upload/7888628.D100TONES.JPG

In summary, whenever a portion of the tone curve is concaved downwards, there will be a loss of contrast because tones will be clumped around that portion, whereas, wherever there is a straight line or concavity upwards, there will be an increase in contrast. One other thing to note with Nikon's implementation of custom tone curves is that you cannot alter separate RGB channels, thus, when you bend the curve, you risk altering the curve for some colors more than others. What I've noticed, subjectively, is that red seems to react to the bending less than the greens or blues. In order to avoid these color shifts, as well as maintain contrast in the low-mid tones, I kept that portion of the curve straight, but increased its slope. In order to avoid blown highlights, however, I started to introduce a concavity downwards "tail" at the end of the curve. This has the effect of making highlights softer and retaining slightly more information in the highlights. In any case, try out the curve yourself and see if you are satisfied.

Here are sample D100 tests from my PBase site:
http://www.pbase.com/atmabini/d100_tests

Click on image to view larger version


Attachment#1 (jpg file)

This is a hot, active topic! Download D100 custom tones here: corrects underexposure [View all] , fotogenetic , Mon 25-Nov-02 01:15 PM
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Reply message RE: Download D100 custom tones here: corrects underexpo
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Reply message You need NC3 to install, and yes, you can return to def
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Reply message I need a clarified and serious explanation on this!
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Reply message RE: I need a clarified and serious explanation on this!
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     Reply message RE: I need a clarified and serious explanation on this!
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          Reply message RE: I need a clarified and serious explanation on this!
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               Reply message RE: I need a clarified and serious explanation on this!
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                    Reply message RE: I need a clarified and serious explanation on this!
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                    Reply message Mark - just downloaded the JLMcurve...with questions
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                         Reply message RE: I need a clarified and serious explanation on this!
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                              Reply message Now we know that both listings are the same person
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                    Reply message I am Apolinario in DPReview! ;-)
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                         Reply message Good hearing from you
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                              Reply message RE: Good hearing from you
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                              Reply message I can still do them, believe it or not
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                              Reply message RE: Good hearing from you
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                                   Reply message Sample of mid-tone lack of contrast
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                              Reply message I tried the JLMcurve
                                   Reply message RE: I tried the JLMcurve
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                                        Reply message Don't hurt yourself!
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                                             Reply message RE: Don't hurt yourself!
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                                                  Reply message Great
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                                                  Reply message RE: Don't hurt yourself!
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Reply message RE: Download D100 custom tones here: corrects underexpo
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Reply message Difference is in highlight details
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     Reply message +0.7 curve like JLMcurve but w/ mid tone contrast benef
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          Reply message RE: +0.7 curve like JLMcurve but w/ mid tone contrast b
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Reply message Okay gang, let's send a X-mas gift to Fotogenetic
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Reply message Thanks for the thought Ben
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