[Blindmath] Questions regarding the resolution of "swell paper"embossing

[George Bell]

A small tip here if you are using the Duxbury Braille fonts.  With
swell paper, you may have notice that the dots "spread" and can be
larger than they should be.

If you use Duxbury's "Braille-Build program, you can reduce the
diameter of the dots, without altering the dimensions of the overall
braille cells and spacing.

We usually find that a setting of between 80% and 90% is good.

George.

-----Original Message-----
From: blindmath-bounces at nfbnet.org
[mailto:blindmath-bounces at nfbnet.org] On Behalf Of kelly marts
Sent: 13 March 2012 20:40
To: Blind Math list for those interested in mathematics
Subject: Re: [Blindmath] Questions regarding the resolution of "swell
paper"embossing

Our braillists are using the duxbury font at 26. Their lines vary
based on need. 
They attempt to follow the Tactile Graphics guidelines from the Natl.
Braille. 
Assoc. K




________________________________
From: Richard Baldwin <baldwin at dickbaldwin.com>
To: BlindMath Mailing List <blindmath at nfbnet.org>;
accessibleimage at freelists.org
Sent: Tue, March 13, 2012 12:13:10 PM
Subject: [Blindmath] Questions regarding the resolution of "swell
paper" 
embossing

I've been searching without success for information regarding the
effective resolution of the "swell paper" approach to tactile
graphics.

I'm aware that many factors are in play, such as the type of ink used
in the printing process and the quality of the heating process.

In general, assuming good ink and heat conditions, does anyone know:

1. How wide must a printed line be in order to be raised in the
heating process?
2. How far apart must two raised vertical lines be to be discernible
as separate lines?
3. How far apart must two raised horizontal lines be to be discernible
as separate lines (if different from vertical lines)?

Thanks,
Dick Baldwin

--
Richard G. Baldwin (Dick Baldwin)
Home of Baldwin's on-line Java Tutorials http://www.DickBaldwin.com

Professor of Computer Information Technology Austin Community College
(512) 223-4758
mailto:Baldwin at DickBaldwin.com
http://www.austincc.edu/baldwin/
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