Because the needs and working habits of photographers vary, different types of films are manufactured. Films for nonprofessionals are made with allowance for the aging process, are usually purchased in small quantities, may remain in the camera for a longer period of time, and do not require refrigeration. Professional films are near optimum color balance when manufactured, usually purchased in large quantities at one time, are processed quickly, and require refrigeration to maintain color balance. At Color Services we encourage recycling and gladly accept old film canisters for this purpose. Before ordering a scan, it is best to know how the file will be used.
Different uses can require significantly different resolutions and file sizes.
The average file size for a scan like this is approximately 350-550Kb. On the other hand, a scan that is going to be output to photographic film needs a file size that is in the ballpark of 18-32 MB for a 35mm slide. Yes, a smaller file size can be used, but at a loss of quality. For that reason, if a scan is to be used for multiple purposes, have the scan made at the highest resolution that will be needed.