@Daniel
If you still have MacOS on the iMac, search for the Image Capture app (inside Applications folder) and use that to scan at default settings. No driver installation required. See how the colours appear compared to the scans from Windows.
If the colours still don't look right when scanned with Image Capture, then something may be wrong with the scanner.
@Daniel
If you still have MacOS on the iMac, search for the Image Capture app (inside Applications folder) and use that to scan at default settings. No driver installation required. See how the colours appear compared to the scans from Windows.
If the colours still don't look right when scanned with Image Capture, then something may be wrong with the scanner.