P3D Re: Slide Scanner Attachment for Flatbed Scanners

[Jonathan Gross <jonathan.gross@xxxxxxxxxxxx>]

> jon forgive me whose last name i forgot passed this great tip along:
>
> > > For those who already own a flatbed scanner, but would like to
> > > scan
> > > stereo slides, I just saw a very clever device being offered by
> > > HP.  The
> > > HP slide Adapter (PN C6260-67700) sells separately for $24.95 and
> > > consists of a small, hollow plastic pyramid that is placed over a
> < > slide
> > > on top of the flatbed of a scanner.  This adapter, which is wider
> > > than a
> > > 2X2 slide and has polished aluminum reflectors on the insides of
> > > the
> > > pyramid, passively reflects light back down through the slide for
> > > detection by the scanner as if it were opaque.
>
> Mike K. responds:
>
> > Thanks Jon for the pointer!!!!  You may have saved me a lot of work.
> > I
> > had been toying with an idea of using mirrors put into slots of wood
> > side-pieces.  Trying one of the HP thingies seems a *whole* lot
> > easier.
>
> and I'm wondering what you guys do to compensate for the gamma
> difference between chromes and negatives?
>
Here is how it can be done using Corel Photopaint.  I'm sure most other
image manipulation packages have equivalent functions that will yield
comparable results:

1)  Scan the negative, and don't worry about the chroma; just try to
maximize the dynamic range.  Most scanning programs, such as HP
deskscan, have an auto/contrast-intensity adjustment.  If you know more
about color, you can adjust it manually, but just remember, dark=>light,

and light=>dark.
2) Open the scanned image in a manipulation package such as photpaint
(if you don't have TWAIN to acquire it from within the package).
Perform
an Image/Transform/Invert.  This will switch it from negative to
positive.  You will notice, as Mike K. responded, that the colors
(chroma) and intensity (gamma) are off.
3) Perform a Image/Adjust/Level Equalization:
        Equalize:
            Channel: RGB Channels
            Method: Proportional
            Auto-Adjust: On
4) Click OK, and you should see a reasonably correct image.

Perhaps someone with Adobe software can post the commands for that
package.

Jon Gross


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