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doc85

West Lafayette, US
397 posts

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doc85 Silver Member Nikonian since 17th Jul 2008
Thu 31-Jan-13 07:26 PM


I have been using CNX2 for several years, but there is so much about it I still don't understand. For instance, I recently discovered you can sharpen separate colors in "Unsharp Mask" and have been playing with choosing different colors i.e. magenta, cyan, red etc. and applying sharpening to them. I think it helps some images, but I don't have any idea how to use this feature properly. Has any one had experience with this?

ericbowles

Atlanta, US
9194 posts

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#1. "RE: Sharpening in Capture Nx2" | In response to Reply # 0

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Nikonian since 25th Nov 2005
Fri 01-Feb-13 09:10 PM

Okay - I'll give it a shot.

I normally sharpen without selecting individual colors. On occasion, with some settings I will select Luminance or Chrominance for my opacity adjustments. This can work well for contrast - and even for sharpening. The same idea can extend to an indiviual color channel. You can reduce halos and other artifacts by applying the effect to only one channel. For example, if you have a blue sky which does not need any sharpening but there is a fine detailed tree and sharpening creates some halos, you might sharpen the red channel and the green channel but not the blue channel. In practice this is pretty unusual.


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doc85

West Lafayette, US
397 posts

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#2. "RE: Sharpening in Capture Nx2" | In response to Reply # 1

doc85 Silver Member Nikonian since 17th Jul 2008
Sat 02-Feb-13 02:23 PM


Thanks Eric, that makes sense. I agree it probably isn't necessary often but your remarks give me a better idea when it might be helpful.

ericbowles

Atlanta, US
9194 posts

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#3. "RE: Sharpening in Capture Nx2" | In response to Reply # 2

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Nikonian since 25th Nov 2005
Sat 02-Feb-13 04:27 PM

This applies to all types of sharpening - High Pass, Unsharp Mask, and Tonal Contrast. Even just applying it to contrast can make sense.


Eric Bowles
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doc85

West Lafayette, US
397 posts

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#4. "RE: Sharpening in Capture Nx2" | In response to Reply # 3

doc85 Silver Member Nikonian since 17th Jul 2008
Sat 02-Feb-13 04:51 PM


So much to learn. i need another 90 years!

KnightPhoto

Alberta, CA
4609 posts

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#5. "RE: Sharpening in Capture Nx2" | In response to Reply # 3

KnightPhoto Gold Member Nikonian since 18th Dec 2006
Sat 09-Feb-13 03:06 PM

>This applies to all types of sharpening - High Pass, Unsharp
>Mask, and Tonal Contrast. Even just applying it to contrast
>can make sense.
>
>
>Eric Bowles

By "contrast" does that mean Luminance? (Thanks in advance Eric!)

Best regards, SteveK

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ericbowles

Atlanta, US
9194 posts

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#6. "RE: Sharpening in Capture Nx2" | In response to Reply # 5

ericbowles Moderator Awarded for his in-depth knowledge and high level skills in various areas, especially Landscape and Wildlife Photoghraphy Writer Ribbon awarded for for his article contributions to the community Nikonian since 25th Nov 2005
Sat 09-Feb-13 05:10 PM

Hi Steve

In the context of this discussion, we are talking about using Luminance for sharpening instead of applying it at the same opacity level for luminance and chrominance. That effectively applies sharpening just to differences in lightness or darkness and can reduce artifacts.

When it comes to Contrast, you can treat it the same way. I'm sure you've seen situations where increasing contrast can cause colors to become too hot or too saturated. By applying contrast adjustments just to Luminance, and setting Chrominance at an opacity level of zero, you can avoid increasing saturation when you are adjusting contrast.

I find this is particularly useful for sunrises and sunsets, and in general bright reds, oranges, and yellows. I can make my blacks deeper and sharper while not blowing out bright colors.

Eric Bowles
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KnightPhoto

Alberta, CA
4609 posts

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#7. "RE: Sharpening in Capture Nx2" | In response to Reply # 6

KnightPhoto Gold Member Nikonian since 18th Dec 2006
Sun 10-Feb-13 12:28 AM

>When it comes to Contrast, you can treat it the same way. I'm
>sure you've seen situations where increasing contrast can
>cause colors to become too hot or too saturated. By applying
>contrast adjustments just to Luminance, and setting
>Chrominance at an opacity level of zero, you can avoid
>increasing saturation when you are adjusting contrast.
>
>I find this is particularly useful for sunrises and sunsets,
>and in general bright reds, oranges, and yellows. I can make
>my blacks deeper and sharper while not blowing out bright
>colors.
>
>Eric Bowles

Wow, have never tried that but I definitely will be. Great tip!


Best regards, SteveK

'A camera is an instrument that teaches people how to see without a camera.' -- Dorothea Lange
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G