I'm using an HP G4050 scanner to turn old family slides into jpg pics. I came to a group of slides that were very red. I don't know whether they turned red over time or whether they were always red. Here's what I did.
In Adobe Photoshop CS3 I clicked Image > Adjustments > Auto Color. That made the biggest improvement. Then I clicked Image > Adjustments > Selective Color > Magenta > -35%. The result is above. I could probably have played with the individual colors for hours to achieve perfection, but the result is acceptable to me.
Posted by Dave