[scribus-dev] cover.py script for perfect bound book cover design is ready.

[JLuc]

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

JLuc

> 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):
> http://www.graphitec.org/epaisseur.html
>
> The following table could be of some use as well:
> http://www.paper-paper.com/weight.html
>
> 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).
>
> Louis
>
>
>     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
>     softcover_mm.py.
>
>     I will publish the versions as they are completed
>     whenever I get a wiki account. I have asked twice
>     now.
>
>     --
>     John Culleton
>     Wexford Press
>     Free list of books for self-publishers:
>     http://wexfordpress.net/shortlist.html
>     Updated PDF e-book: "Create Book Covers with
>     Scribus 1.4.5" coming soon at
>     http://www.booklocker.com/!
>
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