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I’m also trying to scan 48-bit color, but working with a Plustek OptiCard 820, and driving it through EZTwain.
The scanner driver definitely offers 16 as a value of ICAP_BITDEPTH, and I can set ICAP_PIXELTYPE=TWPT_RGB and then ICAP_BITDEPTH=16 (and I verify the bitdepth=16 setting with a following MSG_GET)
Then I set XFERMECH to memory, and compression=none.
I enable the DS, and when XFERREADY arrives I do a DAT_IMAGEINFO/MSG_GET – which tells me the image is 24 bit color!
Jim – I can try juggling the order of cap setting around to match your suggestion. Is your cap ordering specifically for HP or is that extracted from the TWAIN recommended capability ordering? Have you used that to do 48-bit scanning and if so from what scanner?
Anybody have a positive experience doing 48-bit color scanning with an under-100$US scanner that can do 48-bit color? Under 200$US?? Any scanner at all???