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Moire/Chromatic Aberration/Purple Fringing - with D800e

Jeroen Bouman
I have serious issues with my Nikon d800e regarding (a combination of) Moire/Chromatic Aberration/Purple Fringing. Maybe I should have bought the normal d800, not the 'e', but that's a different story ☹️

Have a look at this raw image in C1, especially around the chest area.
Moire and purple shows up on the left of the image, green on the right.
In C1, I can correct it a little bit with CA and Purple Fringing turned on, but not more than, say, 40% of it.
Create LCC (enable uniform lighting) doesn't do anything for this photo.
Moire in C1 doesn't help either.

I have sharpening turned of, and the correct lens profile is loaded (85mm/1.4G). Process recipe is set at 16 bits, Adobe RGB.

In Adobe Raw Converter I can correct 95% of the problem, but I've never liked the look of ARC. If anybody has a suggestion how to solve this in C1, I'd really like to hear it!
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Comments

11 comments

Date Votes
  • thowi
    Try these settings:

    http://www10.pic-upload.de/18.12.12/6p1rfo1ow1sw.jpg
    http://www.pic-upload.de/view-17358657/ ... s.jpg.html

    You will see some serious color bleeding with these settings (especially due to the moire settings). So you have to either apply moire on a layer in C1 and paint in only the affected areas. Or create a variant - the primary variant adjusted to look "good", the secondary variant (duplicate primary variant) adjusted to reduce moire and color artefacts - and paint in affected areas on a layer in Photoshop.

    Non AA filtered sesnsors show moire ... that's the nature of the beast.

    ________

    before/after:

    1.) http://www.pic-upload.de/view-17358789/cc01.jpg.html

    2.) http://www.pic-upload.de/view-17358796/cc02.jpg.html
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  • Jeroen Bouman
    Hi thowi,

    Thanks a lot for all your efforts! The settings you suggest help a lot, especially changing the 'Base Characteristics" from 'Film Standard' to 'Portrait' - I would have never thought of that. Gives a me a good new starting point, so thank you again.
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  • thowi
    You're welcome.

    Also pay attention to the "details" slider in the advanced noise reduction tab. with fabrics the setting may enhance moire and/or other artefacts.

    The approach above is actually based on color blurring...
    There is another way to fight moire. But it requires Photoshop.
    Moire is mostly different in the 3 color chanels of your RGB image (RAW or TIF). Often moire is only apparent in 2 of the 3 color chanels.
    In your image above the red chanel contains almost no moire. Now, in Photoshop you can copy the red chanel into the green and blue chanel and the moire is pretty much gone. Of course your image is black & white now.
    If you are experienced with curves you can adjust the 3 color chanels so that the original color and gradation is restored. Alternatively you can add the b/w image on a layer on top of the color blurred image (from above) and set the layer mode to "luminance". this way you only have to adjust luminance/contrast which is mostly pretty easy.
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  • Jeroen Bouman
    Alternatively you can add the b/w image on a layer on top of the color blurred image (from above) and set the layer mode to "luminance". this way you only have to adjust luminance/contrast which is mostly pretty easy

    That's an interesting approach, but I'm not sure I'm getting this right:
    1- in PS duplicate layer
    2- select & copy red channel into green ch, also into blue ch.
    3- set layer blending mode to luminosity (you write 'layer mode' but then I cannot adjust anything anymore)
    > now the image looks a bit washed out
    4- adjust luminance/contrast. How, with levels, curves? In what color channel?

    Hope you can clarify this a bit more!
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  • Paul Steunebrink
    [quote="Jeroen11" wrote:
    ...
    Hope you can clarify this a bit more!

    +1
    Would be interested to learn some of these techniques I am less experienced in. Thanks in advance.
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  • thowi
    there you go…

    ugh... the images don't fit into the forum layout. Right click on the images and select "show graphic" (or whatever in your browser ...).


    First, process 2 TIFs from Capture One:
    1.) a primary variant, adjusted to look to your liking but without moire correction/color blur applied (you need this to preserve all the image areas that are not affected by moire and therefore would suffer from the color blur the chroma NR and especially the moire tool apply)
    2.) a duplicated variant with moire correction/color blur applied

    In Photoshop duplicate the primary variant and copy the red channel into the blue and the green channel.
    So you end up with 3 TIFs (1 primary variant, 2 red channel TIF from the primary variant, 3 duplicated variant color blurred ):

    http://home.arcor.de/thowidaten/fc/process.jpg

    http://home.arcor.de/thowidaten/fc/process_zoom.jpg


    Step 1: put the color blurred variant on the background layer

    http://home.arcor.de/thowidaten/fc/step01.jpg

    Step 2: put the primary variant (with moire) on the second layer.
    Erase affected areas with a soft brush.
    For this quick and dirty description I've simply erased (almost) the whole suit.

    http://home.arcor.de/thowidaten/fc/step02.jpg

    Step 3: put the red channel TIF on the third layer.
    Erase all the areas in which pattern moire actually looks worse than in the color blurred variant.
    Set the blending mode (yes, you are correct… I am not so familiar with the English naming of the tools) for the third layer to "luminance"

    http://home.arcor.de/thowidaten/fc/step03.jpg

    Step 4: the red channel variant is brighter than the actual image.
    Apply a curve. Select the icon to apply the curve only to the layer below (in CS6 the design of that icon changed).
    Adjust the luminance so that the image looks balanced

    http://home.arcor.de/thowidaten/fc/step04.jpg

    Step 5: in this case I've reduced the layer opacity of the third layer because I feel it looks a bit better.

    http://home.arcor.de/thowidaten/fc/step05.jpg

    Here's the layered TIF with all the adjustments (8bit + downsized to reduce file size ... ~ 8MB).
    Created in CS6 ... not sure prior versions will read all adjustments correctly (I assume they will):


    Basically you have to choose a method case by case… there's not one single approach that works all the time.
    For instance for your image I think you could just as well live with the primary and the color blurred variant (so step01 and step02) … the additional red channel TIF on an adjusted luminance-layer evens out the pattern moire a bit more… but you have to decide whether or not it's worth the hassle.

    http://home.arcor.de/thowidaten/fc/final.jpg

    Hope that helps.
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  • Jeroen Bouman
    Hi thowi,

    Now I get it, great technique! Thanks for the very extensive tutorial you've made, I really appreciate it. Happy holidays!
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  • Paul Steunebrink
    Hi thowi,

    Awesome. Thanks for the effort and taking time to explain.
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  • Edward Caruso
    my quick technique for moire is all in photoshop.
    you have your base layer with the moire. select (by color range, lasso, or pathing is the best) the offending area, copy it to its own layer. apply gaussian blur to that later - i used 18px. then set that layers blend mode to color.
    this will remove most color moire, but some colors might bleed into areas that don't have moire (especially if you dont have a good selection) so you will have to mask or erase those areas. then in this case the color is still shifting all over the place so i sampled a good color swatch of the jacket and made a color fill layer with that color, clipped it to the blurred layer and set blend mode to hue.
    i get everything pathed in Asia so its easy to select particular items of clothes for this method.
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  • Edward Caruso
    anyone else think that 800e file gets "crunchy" really fast? I added a tiny bit of high pass sharpening and i saw alot of artifacts. i wouldn't want to retouch those for fashion/beauty work.
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  • Jeroen Bouman
    [quote="Edward51" wrote:
    anyone else think that 800e file gets "crunchy" really fast? I added a tiny bit of high pass sharpening and i saw alot of artifacts. i wouldn't want to retouch those for fashion/beauty work.


    C1 sharpening is too aggressive for the d800e, agreed. Just set the sharpening lower or (as I do) to zero. You can then set it as a default (per camera!) in C1 by clicking the down-arrow in the upper right corner of the sharpening tab.
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