In article ], isw
wrote:

This is on a Mac, BTW.

I have a large number of scanned slides bearing a color profile
(assigned by the scanner) that gives iPhoto fits; I'd like to change it.

iphoto does weird things with colour profiles. use something else if
possible.

what profile did the scanner give it?

Using ColorSync, I can "assign" a different profile, or I can "match" to
a different profile, but I do not understand which I should do, or (more
importantly) what the difference is between the two. Further, I don't
know which profile I should move to: "Generic RGB"; "sRGB"; or what? The
images are my own, and will not be displayed on the web. I'd like to
keep them at the highest possible "accuracy" (whatever that means).

assign means just that, you are assigning a profile to an image, which
says 'this data is in profile z.' the data is not changed, it just
tells the system how to interpret the data. if you assign a different
profile, your image will look different.

match is probably the same as what photoshop calls convert to, and it
means it will take the existing data and convert that data to a new
profile, using the assigned profile as a source profile, if any. the
data will be changed and the image should look roughly the same,
subject to any limitations in the destination profile.

A whole lot of googling has produced many descriptions of *how* to do
these things, but nothing on *why* or *which*.

Can anybody shed some light, please?

pun intended?