Heidelberg S3400 Aperture Size

flatbed scanners for Linotype

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Scanner: Heldelberg S3400
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Heidelberg S3400 Aperture Size

Postby joemcfadden » Wed Aug 14, 2013 8:45 pm


I would like to find the correspondence between scanner aperture size and the chosen scanning resolution in Auto Mode for the S3400 drum scanner. My question is exactly the same as this one which was previously asked about the Howtek 4500

I want to experiment with different aperture sizes for my scans. I realize that the aperture will be automatically determined by the software tot use one of the 38 apertures on this scanner based on the resolution DPI value that I enter for the scan. But I don't know what aperture (in microns um) corresponds to any given DPI setting (or range of DPIs). I want to know this so I can relate the aperture to different film grain types.

If you can provide basically the same information as this example from the Howtek but for the Heidelberg S3400, that is exactly what I would like to know.

Thank you very much for all your help.


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Re: Heidelberg S3400 Aperture Size

Postby LSI_Ketelhohn » Thu Aug 15, 2013 10:21 am

Dear Joe,

I am sorry but we unfortunately do not have that information available for that device.

Maybe the hardware support for your scanner knows these values.

kind regards,
Arne Ketelhohn.

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Joined: Fri Feb 14, 2014 8:01 am

Re: Heidelberg S3400 Aperture Size

Postby tumleh » Tue Mar 04, 2014 5:44 am

Hi Joe,
I'm a former Hell Scanner trainer. Your question about aperture depends on two factors: Resolution and scaling.

For example: If you scan with 300 dpi and 100% scaling - the Scanner has to analyses 300 adjacent scanning lines within 1 inch. No overlapping and no gap between. That means: The aperture diameter (Scan line) is excact 1/300 inch wide.

There are fine adjustments for the aperture:
If aperture larger = image smooth, however slidly unsharp.
Maybe good for skin tone.
If aperture smaller = more grainy, but not sharper! Loss of fine detail.

If you scale up 200% the aperture diameter would be 1/600 inch. Scan time is double.
Scaling down 50% - diameter 1/150 inch. Scanning time is half than 100%
However the final scan will always result in a 300 dpi image.

Hope this tip is still of value for someone :wink:

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