I've been using Prism for years getting very good results on numerous different papers.  I recently purchased a new printer and went to profile it, and started having problems with my scans.

I pulled up a scanned target from over two years ago and compared it using an eyedropper in Photo Paint to one just scanned.  Using the same settings - no image correction - they are different.

I have uninstalled and reinstalled Prism and the updated the scanner software.  So have you ever heard of a scanner going bad or do I need to mess with the scanner driver some more?

Epson 4870 Photo scanner, Windows XP, Prims 6.03

Hi Terry,

Yes, this scanner has the ability to turn off all color controls - which I have done.  I even found a button to reset everything to factory.

I am using the R070919 target.  On the scan from two years ago, the A8 patch reads 129,44,46.  On the recent scans it reads 177,32,67 - which Prism flags as out of range.  The gray scale is coming in almost perfect, though it is now flagging the white and black patches.  Looking at the target overall, it appears that the saturation has been kicked up; but the driver/interface is set for no correction.

I am getting better results [read: fewer flagged patches] when I scan in 48bit instead of 24bit (though the older scans were 24bit and had fewer flagged patches).  I see that Vuescan has a free trial, I may give that a shot.