Re: [hylafax-users] Vertical resolution: HighRes ?

[Dmitry Bely <dbely@mail.ru>]

Giulio Orsero <giulioo@pobox.com> writes:

> 4.1beta2
> 
> man sendfax talks about -m and -l for low (98) and medium (196)
> resolution.
> 
> So, is there an high resolution?

It does not exist. Only two resolutions (98x196 and 196x196) are supported
by Hylafax. T.30 defines the following possible options:

R8 x 7.7 lines/mm   (normal)    -- mandatory
R8 x 15.4 lines/mm  (fine)      -- mandatory
R16 x 15.4 lines/mm (superfine) -- optional
200 x 200 pels/inch             -- optional
300 x 300 pels/inch             -- optional
400 x 400 pels/inch             -- optional

where

R8 = 1728 pels/(215 mm +/- 1%) for ISO A4
R8 = 2048 pels/(255 mm +/- 1%) for ISO B4
R8 = 2432 pels/(303 mm +/- 1%) for ISO A3
R16 = 3456 pels/(215 mm +/- 1%) for ISO A4
R16 = 4096 pels/(255 mm +/- 1%) for ISO B4
R16 = 4864 pels/(303 mm +/- 1%) for ISO A3

Where are also some propietary options, e.g. gray-scale mode, but of
course they are completely undocumented.

Hope to hear from you soon,
Dmitry




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