Photoshop CS6: Question about Resolution when Post-Cropping Film Scans

Question

Hopefully, somebody with more understanding than I on this topic, can help me with this.
I am about to get a film scanner I have on order, to scan in 35mm negatives. I've had one before but I had problems with the model and had to return it.
When scanning film frames, I like the idea of setting the scan area marquee, at the scanning stage, so that it scans slightly beyond the film frame edges, so that I can carefully crop to the edge of the film frame later, in Photoshop CS6, rather than setting it, at the scanning stage, and then later, when examining the film frame in CS6, maybe discovering that I have not scanned to the edge of the film frame quite enough, as I can easily zoom right into the image when in CS6, to carefully examine where the film frame edges are.
My concern about doing it like this, though, is that I may be reducing the resolution of the image. For example, say I scan a film frame in at 3600ppi, and later crop the image slightly in CS6 in order to precisely trim off any slight amount of black around the film frame edges. By cropping the film frame like this in CS6, am I reducing the image resolution of the film frame to lower than 3600ppi? As I best understand it, I do not think post-cropping like this results in any reduction in image resolution, but am I correct in thinking this?

Answer 1

Hi.
The scanner is a Reflecta ProScan 7200. As I said to station_two, I am in London. I understand the brand is known as 'Pacific Image' over in the US.
The scanning software I will be using it with will be 'SilverFast Ai Studio 8'.
Do take a look at this excellent review of the scanner:
http://www.filmscanner.info/en/ReflectaProScan7200.html
(I may be incorrectly assuming too much when on these forums that I am speaking exclusively with folk from the US - the way you spell 'labour' makes me think you are not from the US?)