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

[Michael Whapples]

While it may be possible to get a small amount of grey scale giving 
different heights on swell paper (I think may be at best nothing, very light 
shading, mid-shading and solid), I believe its not very reliable as height 
of swell can be affected by amount of heat or time it is heated. In short 
grey scale is not something normally used on swell paper. Textures for 
different areas I think is more popular to distinguish between regions.

Michael Whapples

-----Original Message----- 
From: Richard Baldwin
Sent: Tuesday, March 13, 2012 9:14 PM
To: Blind Math list for those interested in mathematics ; 
accessibleimage at freelists.org
Subject: Re: [Blindmath] Questions regarding the resolution of "swell 
paper"embossing

Thanks to both of you. That is the type of information that I was looking
for.

A resolution of between 2 and 3 mm is similar to the dot spacing of 12 dpi
on Amanda's Juliette embosser, but is less than the 18 dpi on a Romeo, 20
dpi on a Tiger, or 25 dpi on a Phoenix.

I assume, however, that there may be some degree of gray scale capability
depending on the height of the raised areas. Is that the case?

Thanks again,
Dick Baldwin

On Tue, Mar 13, 2012 at 3:39 PM, kelly marts 
<kellyvision at sbcglobal.net>wrote:

> 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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-- 
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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