Firstly, and most importantly, make sure that you are scanning from an original public domain source. If you are scanning from a photocopy of such a source, the person who made the photocopy must submit a Creative Commons Public Domain Dedication for the photocopy. The reasons for this, and the procedures to follow for making the necessary Creative Commons Public Domain Dedication for your scans are discussed in Information on the Public Domain, Copyright, and Licensing Principles for this Digital Reprint.
Secondly, please consult the Editor first to see what needs to be scanned. There's a lot of Holtzapffel, and no sense in duplicating efforts.
Thirdly, scan at a resolution of 1200 dpi (or the international equivalent) or higher, in at least 8-bit greyscale (that is, as a "black and white photo" rather than a "black and white document," if presented with such an option). 1200 dpi is a high enough resolution that it is unlikely that the text will need to be rescanned in the future, yet it is a low enough resolution that the image files generated will be within the capabilities of current computers. However, if you are scanning photographs, you may wish to use a higher resolution. The online reprint will present them in lower, more manageable, resolutions, but the S.O.T. library will always (we hope) have copies of the original scans at full resolution for those who might need them.
If your scanning software permits it, set the "unsharp mask" setting OFF. The "unsharp mask" process will produce a scan that appears to look better, but in fact it discards information from the original scan. It is better to record the scan as accurately as possible; "unsharp mask" manipulation can be done in image editing software later.
[note on file name conventions?]
Fourthly, save each scan individually as a "PNG" format file. If your scanning software does not support PNG (most do, as it is now a quite standard format) you should consider upgrading to software which does. If you don't, then the "TIFF" format will do as well (though it is less compact) or, now that its patents are exired, the GIF format. PNG is the best option, though. Do not save to "JPG" ("JPEG") format, as this format is "lossy" and discards information from the scan. The online presentation may use JPEGs because they are compact, but the original scans should be saved in a "lossless" format. If your scanner insists on some other format, please contact the Editor to see if he (I) can convert this format into PNG.
Fifthly, for each batch of scans you submit, execute a Creative Commons Public Domain Dedication as described in Information on the Public Domain, Copyright, and Licensing Principles for this Digital Reprint.
Sixthly, "burn" your scanned image files, along with a copy of the e-mail "Receipt" from the Creative Commons Public Domain Dedication, to one or more CD-R disks in ISO9660 (or ISO9660 + Rockridge, or ISO9660 + Rockridge + Joliet) format, or to one or more DVD+R disks in UDF format. If you have problems, contact the Editor and we'll exchange some test disks to ensure that they can be read. Do not e-mail the scans to the Editor, as he (I) am on a slow net connection that cannot handle huge image files.
Finally, in addition to integrating them into the Reprint project, the Editor will send copies of your scans to the library of the Society of Ornamental Turners.
The text and images of Holtzapffel are in the public domain.
All reprinted examples from Holtzapffel used in this page,
if any, are dedicated to the
Public Domain.
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copyright © 2004 by David M. MacMillan
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A Reprint of the Holtzapffels' Turning and Mechanical Manipulation