I would have thought so.
As ACR is doing the demosaicing itself, upsampling should actually be a modification to this process. My logic is that, as it has to interpolate anyway, it just has to interpolate some more!
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.
Thanks to you both for your answers.
That confirms that my thinking on this is correct then. And I agree Noel that even a low ISO image would probably need some NR applied if it's going to be upscaled to any significant amount.
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I did also a lot of testi
ng about upscaling in ACR of after conversion in Tiff and I came at the
same conclusion: in my opinion it is better upscaling with ACR.
Related to sharpening and noise reduction, I did NOT find any standard set of values, but different values according to the different types of images, but always, in my opinion, a bit of noise reduction is needed.