Filter ordering question for B&W

[johnp]

I was curious about where to do monochrome conversion in the process flow, so I opened an image
and used a splitter to create create two workflows with Monochrome and Unsharp Mask operations in
opposite order. The results compare, on a simple test, to be be identical assuming identical settings
for both operations. On the surface, this is a bit puzzling, I would have different results. I suspect
that since Unsharp Mask must operate on each color plane separately and it is a linear operation, that
the result pf the two operations is communicative, ie, the result is operation order independent.

I can imagine operations where this is not true, but in this case I suspect it is.

Comments or observations?

Thanks!

John P

[jsachs]

I might expect some differences between the two depending on the method of conversion from color to B&W, but they should be very minor.