Why has Microsoft abandoned TWAIN? WIA just doesn't have the features that graphics artists are used to using with TWAIN drivers. For example, my Epson scanner TWAIN driver supports: Resolution, Target Size, scaling, trimming, Unsharp mask, Descreening, Back light correction, Dust Removal with ICE support. Adjustments like Auto exposure, tone correction, image adjustments and color correction.
WIA? Has very limited adjustments like resolution and brightness/contrast.
If Microsoft wants to keep the graphic industry to use WINDOWS instead of a Mac, we need better scanning support under 64bit OS!