ChrisR
I'm a well known grump...
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- Chris
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That cyan colour shows that the leaves are out of the output colour spaces gamut, but they are mostly not over-exposed (that shows as green). In the input tab you really need to change "bits per pixel" to 16/48 bit colour and set a colour space with a wider gamut, Adobe Wide Gamut is likely the best choice (the sRGB profile is really very limited for the purposes of scanning slides as they way exceed its coverage). You can always down-convert to 8/24 bit colour and sRGB etc later (you can set it in the output tab if you want) as remember that at the scanning stage you want everything from the frame as much as possible.
I am VERY confused about colour spaces, though I have read up about them countless times. Anyway, my confused thoughts at the moment go thus: if the colours of the slide are out of gamut for my Mac (Apple RGB) and/or sRGB, then as you suggest they will need to get changed anyway. Does it make much difference if they are changed by Vuescan on the one hand, or i on the other hand I adjust Vuescan to scan in a wider colour space, and then down-convert myself later (by some as yet unknown means)?