@alvise wrote:
I have read more accurately paragraph “Changing the Image Attributes” (TWAIN 1.9a spec, page 4-88) and you’re right: TW_IMAGEINFO can’t be used to set scanning parameters using the DG_IMAGE / DAT_IMAGELAYOUT / MSG_SET triplet.
I think that TW_IMAGEINFO structure can’t be used even with “DG_IMAGE / DAT_IMAGEINFO / MSG_SET” triplet. See same page.