[scribus-dev] cover.py script for perfect bound book cover design is ready.
jluc at no-log.org
Wed Dec 24 11:25:34 UTC 2014
Le 23/12/2014 22:27, Louis Desjardins a écrit :
> Europe uses GSM (grams per square meter) and thus printers seem to use a different formulae to get the spine thickness.
Paper with same 'grammage' (GSM = g/m²) can have different thickness.
According to provided link http://www.graphitec.org/epaisseur.html,
thickness formula for inner pages is :
specialpaperfactor x grammage x nbpage / 2
With "standard papier", specialpaperfactor = 1
With "papier couché", specialpaperfactor goes 0.85 to 1.15
With "papier offset", specialpaperfactor goes 1.05 to 1.25
With "papier bouffant", specialpaperfactor goes from 1.15 to 1.70
> One is described here (in French but I guess a Google Translation could be of some help; it’s not overwhelmingly
> complicated to figure out):
> The following table could be of some use as well:
> I guess we have a few paths to consider with this script. Either we give the user the mean to "calculate" the spine
> value (which in fact may seem more "open source" by it’s "pedagogic" angle), or we give the user the mean to set the
> cover with the proper spine as provided by the printer (which puts all the responsibility of the exactness of that
> calculation in the hands of the printer, something a lot of designers will be very glad with).
> Finally what added width and height for trim is
> common in Europe? In the USA 0.125 is the
> standard expectation.
> I set margins in inches at 0.25 + 0.125 = 0.375.
> What would be the comparable expectation in a
> cover template in a metric environment?
> I will rename my inch version of the script to
> softcover_inch.py and the metric version as
> I will publish the versions as they are completed
> whenever I get a wiki account. I have asked twice
> John Culleton
> Wexford Press
> Free list of books for self-publishers:
> Updated PDF e-book: "Create Book Covers with
> Scribus 1.4.5" coming soon at
> scribus-dev mailing list
> scribus-dev at lists.scribus.net
> <mailto:scribus-dev at lists.scribus.net>
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