PhotoLine 32 from http://www.ciebv.com can do that. You have to put yourQuote:
>I have a business process which requires me to scan a huge number of
>documents, each document spanning 3 pages. What I'd like to be able to do
>scan them and instead of storing them as individual TIFF files, I'd like to
>collate them so that every three consecutive pages get stored as one Multi-
>page TIFF file, that way I have one file for one document, as opposed to
>file per page. Is there any easy way of accomplishing this? Alternatively,
>there any command-line based Windows software that will take three
>TIFF files and combine them into one single multi-page TIFF?
three images in three layers and PhotoLine 32 will save it as one image.
PhotoLine 32 Shareware imaging software Windows95/NT