I have just taken a look at the SANE2 documentation, and a couple of things have struck me about lack of support for some features in filmscanners.
The first is multipass scanning. Basically what happens here is that the scanner can read the values several times and returns the averaged result. This is useful for reducing noise from the A/D in the image data. Sometimes you can simulate this by making multiple passes and averaging the images, though it is not as good as it leads to a slight loss in resolution. Batch scanning is the other. Here you might have a film or slide holder that has several separate images (or even an APS adaptor) and you just want to click a button to scan the lot. You need some way to communicate to the front end just how many images there are to scan etc. You also possibly need some way to allow the front end to pick an individual image to scan. Focusing, although most units are now autofocus, you can often override this for manual focusing if you want. I see no support of this in the proposed standard. I presume that a fourth infra-red channel would also be supported but can not see anything about it in the documentation. JAB. -- Jonathan A. Buzzard Email: jonat...@buzzard.org.uk Northumberland, United Kingdom. Tel: +44(0)1661-832195
