Re: Slide Spotting....

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

Jeremy Hinton inquires:

>My feeling is that the spot should go in the lower left corner as 
>you view the slide (as on a realist format slide).The spot is 
>then visible to the projectionist if he slide is projected. Colour 
>can code left and right, but even for folks with good colour vision,
>the view of the slide itself in a projection theater might cause 
>problems. Do you projectionists prefer spot on the left of the 
>left slide, and spot on the right of the right side?. .

The system as I learned it is, red dot on lower-left of left slide,
green dot on lower-left of right slide, as viewed in a viewer (i.e.
upright, emulsion side toward light).  The colors agree with the
international standard for navigation lights (red=port, green=starboard).
The placement of the dot is consistent left-right so as not to create
confusion.

>I am confused about the colour coding because both a 'red for right' 
>and 'red for left' Standard have been mentioned in the Stereo Soc 
>Bulletin/Journal. They are directly conflicting. The author of the 
>more recent version acknowledges the problem (apparently due to the 
>conventions for anaglyph glasses/images) but is so diplomatic to the 
>previous writers that I remained confused. 

Actually I don't see why there should be a confusion with anaglyphs,
because you wear the red lens over your LEFT eye, which matches the
red=port=left convention quite nicely.  The 'red for right' variant
is probably based on the mnemonic (R/R) connection.

        -Greg W.


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