I've just emailed Ed Hamrick asking whether he'd be able to add the
following feature to VueScan: make it possible for VueScan to perform a
multi-pass scan when scanning from files stored on the hard disk.
What exactly do I mean? Well basically I'd like to be able to have
several images in the usual scan0001.tif scan0002.tif etc format in the
source directory, and to tell VueScan how many images to scan through
when I press the "scan" button, and to integrate those separate images
into one image, just like when you tell VueScan to do a 4X multi-pass
scan to get rid of noise.
Why would this be useful? I've just got myself a digicam, and I'd like
to be able to take longer exposure shots than the current limit of 15
seconds. This would be possible if I could take 4 or more 15-second
shots from the same position, put them into the VueScan source
directory, and set VueScan going. Apart from reducing CCD noise in the
eventual images, it would also make it possible to get brighter images
without amplifying noise.
Another use could also be to fake multiple exposure shots. Rather than
cranking the shutter whilst retaining the film in its current position
and taking a second exposure, and hoping that the two images were
aligned, this could also allow (with a couple of extra settings) to
integrate the two images into one image seamlessly from our favourite
scanning application VueScan :-)
Given that most of the functionality is already there in VueScan, why
not enable multi-pass scanning for "scan from disk" operations?
Would anybody else find this feature useful?