Re: [photo-3d] RE Slide Scanner

[Project3D@xxxxxxx]

In a message dated 26/03/01 19:44:32 GMT Daylight Time, Mark Blum wrote:

<>

Actually, I was trying to put resolution into context. Whilst all the 
scanner, camera et al manufacturers can only quote the output resolutions of 
their devices (and many of those use the highly misleading "interpolated" 
values!), very few users know what resolution they actually need! If only 
people could think in terms of the number of pixels that they need for their 
output! But even this can be misleading, with printer manufacturers quoting 
"28800 dots" etc...  

<<My question is for those on the list who output
 to film recorders NOT using non-pin registered camera backs, what
 is your experience with registration? My only test with a Polaroid
 camera back showed that the digital duplicates are NOT registered,
 and misaligned both vertically and horizontally. Worse yet, they
 are not centered with respect to the slide perforations. This means
 that the dupes from the recorder cannot be dropped into Wess pin
 registered mounts. In other words, if you want proper alignment,
 you must critically remount each duplicate pair! For me, that is
 totally unacceptable. I am wondering if anyone has had alignment
 success with a non-registered back. Can anyone comment on their
 experiences?>>

Well, I can only speak for my Agfa PCR II / RasterPlus combination.

Firstly, the camera is not pin registered. But I've just cut three title 
slides from the "Tribute to Handel" sequence which have white out type. I 
used the same basic images for these and a variety of white type layers for 
type other than the basic, so I have something like seven pairs of slides 
which (as far as the headline, at least) should be identical.

I don't have a pin registering jig, so I used an approximation, but I can see 
through three thicknesses of type and perfect perforations. I'd say that's 
pretty close! 

The RasterPlus software automatically centres the image in the frame, and 
sizes it so it's as large as possible. Then it adds a black border. (I can 
control this behaviour if I want to... One thing that I have to watch out for 
is when I have a Realist or other "portrait" format image. The software 
rotates it to get the image as big as possible...

Bob Aldridge

 

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