Onto the fun part then. Please look at the blue channel and what happens to it in 7200 DPI scan.
This is the preview window of 3600 DPI scan:
This is the resulting image, the blue channel looks exactly how it should — the same way as in Ai:
Another preview, it's all the same, just changed the resolution to 7200 DPI:
And here's the resulting image, as you can see, the blue channel for some reason gets stretched a bit to the right and that introduces a blue cast:
Just to get this out of the way, yes I have deleted the preferences and reinstalled Ai, this did not make a difference.
Here's another more drastic example. In this scan I deliberatly ask Ai to reduce blue channel contrast and squeeze its histogram by changing the highlight output value, check out what happens.
Scan shot, asking to reduce blue channel contrast:
Resulting image scanned at 3600 DPI, blue channel looks as expected:
Resulting image scanned at 7200 DPI, what is this??! Looks like someone took a bite out of the blue highlights!
So, any ideas what the culprit is?
