"isw" wrote in message
]...
In article ,
me wrote:
You also
haven't mentioned what format you are saving in. A wider color space
may bring about issues given the wider space must fit into a given
amount of storage bits and hence there may be less graduations of a
given color available.

Saving as "high quality" JPEGs; these are 35mm slides, scanned at 4800
ppi on a scanner that *claimed* to be able to handle it. But there's
nothing about the JPEG encoding process that forces a restricted gamut.
Storage space is not an issue, but I need to deal with iPhoto's problem
with the scanner's profile, and I don't want to throw anything away in
the process.

Then you should archive the scans as they are, without converting the
colorspace. Your choices for JPEG are 8 bit and 16 bit. As he pointed out,
converting to a larger gamut requires more bits to maintain the same
gradation in the larger space as 8 bits in the smaller color space. A
lossless conversion will double the size of each file in the new colorspace.

Would you mind posting or emailing a small crop of a 4800 ppi scan? I have
never seen a scan that fine. Can your scanning service handle medium format
and sheet film sizes? What technology do they use?