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Old 11th of May 2007 (Fri)   #1
philmar
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Default Noise reduction - unsharp mask - CS2

I have a question for the techie types here.
I notice that when I do a large batch process for noise reduction (using actions) in CS2 that the time involved is dramatically longer than it takes to do a batch action 'resize - unsharpen mask - convert color space- 8 bit mode- save as' (using the exact same batch side)
I am curious as to why CS2 noise reduction takes much much longer than all the other actions combined?
Is there something about noise reduction that requires more memory or CPU processing?
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Old 11th of May 2007 (Fri)   #2
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Default Re: Noise reduction - unsharp mask - CS2

Not sure which Noise Reduction you are using, the PS version built-in or a plug-in. But yes some just take more time then others.
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Old 11th of May 2007 (Fri)   #3
philmar
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Default Re: Noise reduction - unsharp mask - CS2

I'm using the CS2 built-in version.

Do plug-ins work faster? I have just spent the last week leaning sharpening - I don't think I have the energy to learn the intricacies and nuances of noise reductions right now
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Old 11th of May 2007 (Fri)   #4
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Default Re: Noise reduction - unsharp mask - CS2

Quote:
Originally Posted by philmar View Post
I'm using the CS2 built-in version.

Do plug-ins work faster? I have just spent the last week leaning sharpening - I don't think I have the energy to learn the intricacies and nuances of noise reductions right now
I don't think that plug-ins work faster. I use Noise Ninja and it takes some time to complete the task. Granted my PC isn't the fastest but I don't use it enough fro it to bother me. Noise was something I used to worry about but very rarely do I use it now.
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Old 11th of May 2007 (Fri)   #5
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Default Re: Noise reduction - unsharp mask - CS2

Anyone know why noise reduction takes longer than sharpening?

Perhaps because sharpening occurs only on pixels on/near edges whereas noise occurs in much larger areas like shadows forcing CS2 to do a lengthier set of pixel related mathematical calculatiuons?
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Old 11th of May 2007 (Fri)   #6
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Default Re: Noise reduction - unsharp mask - CS2

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Originally Posted by philmar View Post
Anyone know why noise reduction takes longer than sharpening?

Perhaps because sharpening occurs only on pixels on/near edges whereas noise occurs in much larger areas like shadows forcing CS2 to do a lengthier set of pixel related mathematical calculatiuons?
It has to be because of the algorythims. Try a more complicated sharpening tool like the TLR sharpening scripts and noise reduction will fly compared to it.
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Old 26th of May 2007 (Sat)   #7
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Default Re: Noise reduction - unsharp mask - CS2

When I use The Noise Ninja plug-in with CS2 on a single shot, it takes around 3-5 seconds to complete the task. Multiply that out.
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