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Sharpening – the true story

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  #1  
Old 05-19-2005, 12:20 PM
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Post Sharpening – the true story

High Pass vs Unsharp Mask

Sharpening is a subject that comes up quite often in the threads.
There are those that defend use of the Unsharp Mask (USM) and others who say that the High-Pass method is better. Let’s look into this......
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Last edited by byRo; 05-19-2005 at 06:23 PM.
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  #2  
Old 05-19-2005, 04:28 PM
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realaqu realaqu is offline
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really in depth tut, thanks a lot

realaqu
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  #3  
Old 05-19-2005, 05:58 PM
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Gary Richardson Gary Richardson is offline
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As usual Ro, you make me think more about what I'm doing. Thanks.
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Old 05-19-2005, 07:15 PM
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Tasty yummers lil snack.

Dave
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  #5  
Old 05-23-2005, 08:54 AM
hpycmpr hpycmpr is offline
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Worth the wait

byRo, thanks for the tutorial. The comparison between USM and HighPass is very interesting. When I sharpen an image with lots of layers, I would create a merge visible layer on top and sharpen that layer.

Sharpening can introduce halos, noise, color shifts and contrast shifts. I find that creating an edge mask before sharpening can protect the masked and unsharpened areas from these. Testing and making tradeoffs between sharpness and these undesireables is the name of the game, and is tedious. Your suggestion to toggle between two layers is a great help.

A couple of related questions:

Some suggest that an image intended for printing should be "over sharpened". Is there any merit to this, and how much "over sharpening" should be applied?

If an image can be improved with local contrast enhancement (i.e. USM with amount of ~30 and radius of ~60), should this be done before or after sharpening?
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Old 05-23-2005, 02:43 PM
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Quote:
Originally Posted by hpycmpr
Some suggest that an image intended for printing should be "over sharpened". Is there any merit to this, and how much "over sharpening" should be applied?
Sorry, but I'm not qualified to reply - I don't print much.
Quote:
Originally Posted by hpycmpr
If an image can be improved with local contrast enhancement (i.e. USM with amount of ~30 and radius of ~60), should this be done before or after sharpening?
Local Contrast Enhancement and Sharpening are exactly the same thing - only done at different radii. I would always go from the higher radius to the lower. So enhancement first, sharpening later.

Sometimes I use "rounding" (my name for it), which is an intermediate radius band (see the 10 minute Toolbox).

So the full sequence is:
1) High Radius: Local Contrast Enhancement, or more often its inverse which is just a mixed in High-Pass High-Radius layer;
2) Rounding: Mid-range, makes people look better! (Especially the ladies) ;
3) Detail / Edge Sharpening: USM for edges or High-Pass (overlay mode) for texture.

Hope this helps,

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  #7  
Old 05-29-2005, 07:56 AM
hpycmpr hpycmpr is offline
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Second helping

Thanks again byRo.

If possible, can you provide a more detailed description and user guide for your Toolbox. In particular, more on "rounding".
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  #8  
Old 05-29-2005, 06:22 PM
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Quote:
Originally Posted by hpycmpr
Thanks again byRo.

If possible, can you provide a more detailed description and user guide for your Toolbox. In particular, more on "rounding".
OK, here you go!

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  #9  
Old 04-18-2006, 06:45 PM
rari rari is offline
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Question where?

byRo, i can't see your "10 minute toolbox", the link don't work.
I'd love to see it!

Please, where is this?


thanks,
rari
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  #10  
Old 04-18-2006, 07:24 PM
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byRo byRo is offline
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Hi there, rari,

Sorry about that. The "toolbox" was in the Resources section which, unfortunately, has been discontinued.

I had promised to post a new version (with tutorial ) but got sidetracked.
Hope I can get round to it soon.

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