If you're referring to the white patches above the child's head and on her clothes, that's dust. Welcome to the world of film scanning.
The most cost effective method is to use the clone tool in photoshop, or something similar. Don't bother if you're not going to do anything with the picture except archive it. For pictures that i print, can spend anything from 5 minutes to 1/2 hour cleaning up the dust... it's very time consuming.
i sometimes use a film wiper before scanning a strip - available at Cathay, i think ~$15. Something like a stapler, put your film btw the rubber strips and pull through. (Disclaimer: if you scratch your neg doing this, not my fault. i'm just sharing what i do w my negs.) Also, check BOTH sides of the film for dust. It is unlikely that you will spot the all dust particles.
Another method is to upgrade the scanner to one of those that use infrared to remove dust. Quite a lot of models around, but i think the cheapest is around 2k range. This one you'd have to shop around.
Keep your scanner properly covered when not in use. Dust that goes in stays in, and will affect every neg you scan. Improvise some covering for your scanner.
i'm glad i turned digital. i still scan film, but not as often. Scanning and cleaning/correcting a roll of film usually takes me 1-2 hours, per roll. A heavy shoot, say 6-12 rolls, will see me stuck at the computer for many nights.
If you have intention of doing heavy scanning (ie everything you shoot), save yourself the time and effort - get one with infrared dust removal. There are even models i saw that can scan all 36 frames at one go, provided the negs are uncut, of course.
No. i make a visual check on the rubber blades before i wipe. But all it takes would be one grain stuck on the rubber blade, so i try to be careful.
Originally posted by S40
Another problem that always occur is that the scanned shots doesn't produce the same color everytime. One shot can appear more greenish, wheras the other will appear more reddish.
Vuescan actually has the ability to 'lock' the background colour by scanning a 'blank' frame. Read the help file again carefully. The feature is called "Lock Film Base Colour", and the help file gives instructions on how to do it.
After 'locking' the base colour, if the colour cast is still there, then it's not the scanner's problem - probably a genuine colour cast in your picture.
Flourescents cause a green tinge, too bright daylight gives weird colurs, and reciprocity failure also give funny colour casts. Try to remember the conditions when you took e pic. (At least you won't be trying to correcting a scanner problem it wasn't one in the first place.)