Why do my very large images show as grainy in ThumbsPlus when they show clear in Photoshop or other graphic applications?
If you zoom to actual pixels in Photoshop you will see the same graininess. You are actually seeing the grains in the negative. In ThumbsPlus, to get the view you desire, go to Options | Viewing | Appearance and check Resample images when reduced. Now go to the Window tab in the same dialog and choose Reduce to window under Initial stretching. Your view will now be as it is in Photoshop.