FW: flexfax: Please help me understand encoding

["Mau, Jonathan" <Jonathan.Mau@nrc.ca>]

> Greetings:
> 
Please forgive me if this is a duplicate, but there is evidence that this
did not make it to the list on the first attempt 2 days ago.

> I have been playing with HylaFAX on and off for some of months now.
> Recently, I have been doing more intensive testing and am puzzled by how
> the
> compression/encoding works.  Some things lead me to believe that the modem
> does the encoding.  For example from the Multitech document "Class 2 Fax
> Developer's Kit" page 23 indicates that 2-D MR and 2-D MMR are not
> supported.  But then some things indicate that HylaFAX does the encoding.
> For example, from man page HYLAFAX(5F) "Documents are automatically
> converted to TIFF/F documents prior to transmission according to the
> capabilities of the remote fascimile machine:  maximum page width and
> length, ability to handle 2-D encoded data, ...".
> 
> Of the 15 or so numbers I have used for testing, all but 2 list their
> capabilities as "supports2DEncoding:yes", yet all the completed email
> messages indicate that 1-D encoding was used.  (This is not quite true, a
> few pages were noted to have used 2-D, but that was a month ago and the
> modems used then are not the same as the ones I am using now.)  The config
> man page indicates that Use2D defaults to yes and I have not explicitly
> set
> it otherwise anywhere.   So why is 2-D compression not being used?  I am
> sending test documents at 196lines/inch vertical resolution pages in about
> 1.5 minutes/page (granted, these are busy pages) and feel that 2-D
> encoding
> would improve this time greatly.
> 
> What am I missing?
> 
> Thanks for all tips
> 
> Jonathan