Ken Hornbrook wrote:
> I sometimes make the first scan with the analog
> gainset for the shadows, then do a second scan
> optimized for highlights, and then merge them
> in Photoshop using masks.
> I am not sure if this feasable in Viewscan. Perhaps
> others who use Viewscan could enlighten us
> about using Viewscan for this.
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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