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anti deconvolution - ACR Capture Sharpening

Jul 27, 2011 6:49 PM

anti deconvolution - ACR Capture Sharpening

 

I cannot remember where I came across this word "anti deconvolution" (likely years back debating here about how best to use Capture Sharpening). I am considering making training videos on "The Ultimate Sharpening Workflow for Fine Art Prints" and want to make sure what I am saying is sound and maybe even accurate! So I am double checking my facts.

 

I believe I was told by someone here that when the Capture Sharpening Radius is set to 0.5 and the detail set to 100 (with the appropriate amount dialed in) that it does something called "anti deconvolution" and can actually extract a very small amount of real detail (as apposed to simply sharpening halos) out of a raw file.

 

Is that a sound statement?

 

BTW, I am a professional landscape photographer (big fine art enlargements) and my preferred way to use capture sharpening is by double/triple processing raw files for various areas then masking them accordingly in PS. But since I am almost always trying to emphasize the ultra fine high frequency details in an image (except sky's and soft moving water) I have found that:

 

Amount (varying)

Radius 0.5

Detail 100

Masking  (varying)

 

Has worked best for me.

 

Cheers.

 
Replies
  • Currently Being Moderated
    Jul 27, 2011 8:35 PM   in reply to ACRFREAK

    It's not "anti deconvolution"...it's called simply deconvolution kernel sharpening...similar to the Smart Sharpen's lens correction. ACR, with Detail set above 50, is a simple sharpening using a generic point spread function (PSF). Ya might want to google it...oh, and it works regardless of the radius setting. The deconvolution is dependent on the Detail slider, not the radius.

     
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    Jul 28, 2011 8:06 AM   in reply to Jeff Schewe

    Jeff

     

    > ACR, with Detail set above 50

     

    Eric Chan was saying that it is not a "switch" (for example @ 50) from one type to another type of sharpening but a gradual blend of USM and deconvolution sharpening when you start moving the slider from 0 to 100... do you have another information ? please clarify.

     
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    Jul 28, 2011 8:34 AM   in reply to deejjjaaaa

    deejjjaaaa wrote:

     

    Eric Chan was saying that it is not a "switch" (for example @ 50) from one type to another type of sharpening but a gradual blend of USM and deconvolution sharpening when you start moving the slider from 0 to 100

     

    I remember that too. Maybe the other type doesn't kick in until 50.

     
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    Jul 28, 2011 9:00 AM   in reply to deejjjaaaa

    deejjjaaaa wrote:

     

    Jeff

     

    Eric Chan was saying that it is not a "switch" (for example @ 50) from one type to another type of sharpening but a gradual blend of USM and deconvolution sharpening when you start moving the slider from 0 to 100...

     

    It's more complicated than that...but when you get to the 40-60 range (which is why I said 50) it becomes predominately but not exclusively deconvolution. The default setting of 25 I don't think has much. Also know that halo suppression also impacts the results. Again by about 50, there's little or no halo suppression.

     
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    Jul 28, 2011 4:49 PM   in reply to deejjjaaaa

    deejjjaaaa wrote:

     

    Jeff

     

    > ACR, with Detail set above 50

     

    Eric Chan was saying that it is not a "switch" (for example @ 50) from one type to another type of sharpening but a gradual blend of USM and deconvolution sharpening when you start moving the slider from 0 to 100... do you have another information ? please clarify.

     

    Here is Eric's link for his suggestion for landscapes:

     

    http://forums.adobe.com/message/3066522#3066522

     
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  • Noel Carboni
    23,514 posts
    Dec 23, 2006
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    Jul 30, 2011 1:03 PM   in reply to ACRFREAK

    ACRFREAK wrote:

     

    I believe I was told by someone here that when the Capture Sharpening Radius is set to 0.5 and the detail set to 100 (with the appropriate amount dialed in) that it does something called "anti deconvolution" and can actually extract a very small amount of real detail (as apposed to simply sharpening halos) out of a raw file.

     

     

    I don't know if you've got the terms right, but those are EXACTLY the settings I have found, through much experimentation, bring out the most possible usable detail from my raw images.

     

    -Noel

     
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  • Noel Carboni
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    Dec 23, 2006
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    Jul 30, 2011 3:14 PM   in reply to ACRFREAK

    If you're not already doing so, try converting directly to upsampled resolutions as well.

     

    -Noel

     
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  • Noel Carboni
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    Aug 6, 2011 2:36 PM   in reply to ACRFREAK

    I think it boils down, then, to what kind of input is best for your "advanced sharpening" step.  I'm using my own fractal sharpening actions for that.

     

    -Noel

     
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  • Currently Being Moderated
    Aug 14, 2011 8:15 PM   in reply to Noel Carboni

    If Detail is set to 100 in PV 2010, you will be using only the deconv-based method in ACR.  Please use carefully and judiciously, as this will try to extract as much detail as possible with minimal regard for noise and other artifacts that may already be present in the image.  (Of course, if you find it is too strong in some areas of the image, you can use local adjustments, e.g., minus Sharpness to back off on the problematic areas.)  I do personally use Detail 100 often, but only in low ISO landscape images with very fine details (twigs, blades of grass, etc.).

     

    If set at a lower value (e.g., 40 to 60) you will be using a blend of the deconv-based method, and another (smoother) method, and I recommend that for more general purpose photography.

     

    Eric

     
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  • Currently Being Moderated
    Aug 16, 2011 8:50 PM   in reply to MadManChan2000

    Moving this kind of sharpening into PS and employing the Surface Blur in the range of 2 to 5 for both sliders takes some of the edge off images that are pushed to far. I frequently do this to avoid that digital sharp look.

     

    But then, I am drawn to the look of the early photographers like Julia Margart Cameron, or Lartigue, where his very sharp look is tempered by that softer overlay. Even certain images of Edward Weston possess this.

     

    Perhaps digital can return to that sensibility. For now, I'll tweak with the Surface Blur.

     
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    Sep 8, 2011 9:27 AM   in reply to MadManChan2000

    MadManChan2000 wrote:

     

    If Detail is set to 100 in PV 2010, you will be using only the deconv-based method in ACR.

    Huh? I am confused ... isn't the Detail slider gradually changing (blending) between Deconvolution-based Sharpening and Unsharp Masking, with the former at the slider's "0" end and USM at the "100" end!? And if Deconvolution-based Sharpening really is at "100" then what's at the "0" end? Certainly not USM ... but "another (smoother) method"? So USM (or anything similar to USM) is not involved at all? As I said—I am confused. Can Eric (or anyone) please shed a little light on this ...?

     
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    Sep 11, 2011 4:42 PM   in reply to 01af

    No.  The deconv-based method kicks in as Detail approaches 100.  Smaller values of Detail mean smoother sharpening (and no, it's not USM).  The important point is that ramping Detail up towards 100 means that ACR will be extracting as much fine detail as it can, and this will result in an image with more bite and texture. This can be good for low-ISO landscape or architecture work with very fine details, and very bad for portraits or other situations where you want smoother results.

     
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    Sep 12, 2011 12:53 AM   in reply to MadManChan2000

    I see ... so my understanding that the Detail slider changed between deconv-based sharpening (at 0) and unsharp-masking (at 100) was just plain wrong. That relieves my confusion. By the way, the practical usage of the Detail slider was clear always; I was just wondering about the underlying technology.

     
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