Upscaling and noise reduction in ACR

I've been thinking about upscaling images and the best time to do so (if I need to of course) in my workflow. As I understand it, it's always best to carry out any noise reduction prior to upsampling an image, as this helps avoid increasing the size of any noise that may be apparent in the image.
However, I'm thinking that in ACR, this in theory would not be neccessary as ACR would carry out any noise reduction and upsampling in a pre-defined processing order. So put simply, I could increase the image size and then carry out any NR as required after upscaling. This would allow me to tailor the NR to fit the increased image dimensions (and of course I could then carry out capture sharpening for the larger image as well).
Is my thinking correct here - does it not really matter in terms of image quality if I don't do any NR before changing the image dimensions in ACR?
M

I did a lot of experimentation with upsampling during conversion.
I found that - in my opinion - upsampling during Camera Raw operation yields superior results to doing it later. I also believe that dialing in some noise reduction during Camera Raw is needed, as even low ISO images get pretty grainy otherwise.
Every camera is different, but what I ended up saving for defaults is this, keeping in mind that I do my conversions to the largest possible image size, then downsample later for specific uses.
Only you know what your goals are and what you like in your images, so I encourage you to experiment as I did with different combinations of settings to try to find the right balance.
-Noel

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$ curl -o file.jpeg -v http://learningtosee.org/aux_photos/sharpening_test.jpg
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* Connected to learningtosee.org (204.16.138.5) port 80
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User-Agent: curl/7.12.2 (i386-pc-win32) libcurl/7.12.2 zlib/1.2.1
Host: learningtosee.org
Pragma: no-cache
Accept: */*
< HTTP/1.1 404 Not Found
< Date: Mon, 19 Feb 2007 21:31:06 GMT
< Server: Apache/2.0.52 (CentOS)
< Vary: Accept-Encoding
< Content-Length: 311
< Content-Type: text/html; charset=iso-8859-1
% Total % Received % Xferd Average Speed Time Time Time Current
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100 311 100 311 0 0 2159 0 --:--:-- --:--:-- --:--:-- 0
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$

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This question was posted in response to the following article: http://help.adobe.com/en_US/lightroom/using/WS67a9e0c3a11b149632d4213d12864349b1a-8000.htm l

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NanceeArt wrote:
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Joe_Mulleta wrote:
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Upscaling and noise reduction in ACR

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