Apply unsharp mask before or after downsizing to final size?
For sharpening photos out of a DSLR, where the final result will be at a lower size compared to the DSLR's output (for example, for publishing on the web), is it better to:
- apply (possibly slightly more) unsharp mask, then downsize? or
- downsize, then apply unsharp mask to taste at the final image size?
I'm looking for what produces the most visually appealing output -- clearer details than in the comparatively soft DSLR image, but not oversharpened.
Intuitively, it's easier to get the right amount of unsharp mask with the image at the final size (because one can immediately judge the results); but does this deprive the filter of data that could have been used to produce a better-looking result?