On Saturday 21 December 2002 15:53, Jonathan Buzzard wrote: > 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.
A backend should make an sane option for this feature. There is no need to make a well known option for this. > > 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. There is a flag that tells that there are more images. To select the image #x the backend can create an option. So there will be support for this. The question is if this should be a well known option. > > 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. The backend can make a sane option form it. There is no need for a well k= now option. > > I presume that a fourth infra-red channel would also be supported but c= an > not see anything about it in the documentation. It is in (or was in, I did not read the last version) Oliver --=20 http://www.xsane.org http://www.mostang.com/sane http://www.rauch-domain.de mailto:oliver.ra...@rauch-domain.de
