Orientation

(Updated 1999 Nov 05)

Scan Orientation

Are scans equivalent to emulsions side up or down?

The image below is a window-capture of zeissflip.mrc, to check whether scans are equivalent to looking at a negative emulsion side up or emulsion side down. If they are equivalent to emulsion side up, then the viewer is effectively looking down the barrel of the electron gun. If they are equivalent to emulsion side down, then the viewer is looking from the perspective of a little bug inside the microscope looking up through the plastic side of the film at the incoming beam.

In looking at the film with the emulsion side up (shiny side up, notch at top right) the numbers for this particular negative are readable, as opposed to a mirror-image of readable. In viewing the scan zeissflip.mrc in rfresh-cam the numbers are also readable (albeit upside-down, which doesn't matter here).

So, the scans are equivalent to looking at the negative emulsion side up.

-T.R.S. 99/03/30

"One small step for The Tick, one giant step for, say...a little bug or some guy who has been shrunk to the size of a little penny." -- The Tick

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