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Thread started 05 Aug 2006 (Saturday) 07:19
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DPP noise reduction & image size. Bug or feature?

 
René ­ Damkot
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Aug 09, 2006 10:56 as a reply to  @ post 1829024 |  #16

DrPablo wrote:
I'd use high radius-low amount sharpening (like unsharp mask with amount 20 and radius 20-50) to sharpen big enlargements without getting too much artifact.

Wouldn't that be just 'local contrast enhancement'?


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DrPablo
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Aug 09, 2006 11:02 |  #17

Yes and no. I mean all sharpening is local contrast enhancement when you think about it.

The point of the low amount is to keep it subtle to avoid artifact.

The point of the high radius (progressively higher at each stage) is to keep the areas of detail recognizable to the interpolation process. As you go larger and larger the program is 'presuming' detail that it fills in, so the actual captured detail gets diluted. This can soften the image. So the local contrast enhancement can keep the edges and details tighter so that the interpolation is more faithful.

I don't know for sure, though. I've never tried anything that large.


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Leandro ­ Bento
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Aug 09, 2006 11:33 |  #18

I didnt know DPP had a noise reduction feature. Where is it located? I have DPP like any Canon user, but never used any NR on my images because I didnt know it existed. How do I apply NR with DPP?

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René ­ Damkot
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Aug 09, 2006 12:28 |  #19

It's in the new DPP (2.1), under preferences. Which is rather silly...


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René ­ Damkot
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Aug 12, 2006 08:27 |  #20

Update: Gave it a try and ran Noise Ninja over the full file. (upscaled)
Results were quite good, but still some 'coarser' noise remained.
The best results I got when running Noise Ninja over the original file, before upscaling. So, for maximum quality, I'ld have to photoshop the entire image again... I don't think I'll do that, since differences were not all that shocking (yet plainly visible). The file 'as is' is good enough for the intended purpose. Next time however, I think I'll purchase either Neat Image or Noise Ninja, and run that before doing anything else...


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Aug 12, 2006 13:58 as a reply to  @ René Damkot's post |  #21

René Damkot wrote:
Update: Gave it a try and ran Noise Ninja over the full file. (upscaled)
Results were quite good, but still some 'coarser' noise remained.
The best results I got when running Noise Ninja over the original file, before upscaling. So, for maximum quality, I'ld have to photoshop the entire image again... I don't think I'll do that, since differences were not all that shocking (yet plainly visible). The file 'as is' is good enough for the intended purpose. Next time however, I think I'll purchase either Neat Image or Noise Ninja, and run that before doing anything else...

buy noise ninja, you will not regret it :)!


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Apr 06, 2007 15:46 |  #22

René Damkot wrote in post #1812233 (external link)
Here I met the first full stop: For some reason DPP won't go to 3 meters wide @ 100dpi.
Maximum image size seems to be limited to 9999 x 6666 pixels.
Strange thing is, that if I apply a crop, the image can be enlarged more. So it seems the maximum output is 9999 pixels wide.

René - you say the picture had to be enlarged to 11,000px wide. Why can't you do two crops, converted in DPP at 5500px wide, of each half of the image, and then align them in Photoshop?


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René ­ Damkot
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Apr 07, 2007 04:57 |  #23

Never thought about that, but I suppose that would have been an option ;)
I'll try that next time...


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DPP noise reduction & image size. Bug or feature?
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