Fraser/Schewe RWCR Book - Sharpening Question

Real World ACR > Great book, good explanations. Compiling questions as I read and re-read. Need sharpening workflow guidance. Let's say I am working on an NEF file that ultimately I want to upsample or crop/upsample in Photoshop. Should I sharpen both in the ACR image detail adjustment phase and then do an USM in photoshop again when I am ready to save my final edit? What effect does upsampling in Photoshop have on image adjustments done in ACR?
MacBook Pro, OS 10.4.11, Nikon D300 NEFs, ACR 4.3, PS-CS3

>Pretty sure sharpening is done before the down sample in Camera Raw in the pipeline and the down sample is a Lanczos algorithm (see http://en.wikipedia.org/wiki/Lanczos_algorithm for geek explanation) which has a "degree" of sharpening in it.
Jeff,
Your Wikipedia link is indeed very geeky--It talks about recovering
Eigenvalues, but doesn't even mention resampling. Perhaps this link is more appropriate
Lanczos Resampling.
I have no idea whether ACR sharpens before or after resampling, but to sharpen before resampling seems counterintuitive, since it is often advised to sharpen after resampling to offset the loss of sharpness occasioned by the resampling. With significant downsampling the sharpening halos would be resampled out of existence. Perhaps the Lanczos algorithm obviates these concerns.

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