Al,
Perhaps you might elaborate on just how you merge the two images? I
experimented a little with two step wedge images and found that just
merging them in "normal" mode and 50% opacity results in reduced
contrast in shadows and highlights - the areas where good tonal
separation would be needed (hope I got the terminology right).
Regards,
Wolfgang
Bond, Alistair wrote:
>
> Vuescan has an "autoexpose" option, which will work out the exposure
> required for the highlights. If you do a preview with this ticked and
> then untick it, it will show the current exposure value. After you do
> a scan with this setting for the highlights, you can then manually
> increase this number to increase the exposure time for the next shadow
> optimised scan. (Doubling the number equates to +1EV, halving it
> equates to -1 EV.)
>
> This will NOT work with the Acer Scanwit as it cannot vary exposure
> time. Otherwise, the only issue is whether pixel registration between
> scans is accurate enough for the 2 scans to be merged without
> softening the image. This varies between different scanners.
>
> Al Bond
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