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EnigmA Amiga Run 1997 July
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EnigmA AMIGA RUN 20 (1997)(G.R. Edizioni)(IT)[!][issue 1997-07 & 08][EAR-CD IV].iso
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1996-06-16
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Epson Stylus Color II(s) printer driver (Beta release 35.3)
---------------------------------------
This driver should enable you to drive both II and IIs printers upto their full
resolution of 720dpi * (see later for some notes on this).
Printer settings such as uni/bi-directional printing and economy mode are left
to the printer. An exception to this is MicroWeave for which there is no
printer-cofigurable option. The density settings in preferences therefore
correspond to the following options:
Density Resolution MicroWeave
1 180x180 No
2 180x180 Yes
3 360x360 No
4 360x360 Yes
5 360x720 No (My printer doesn't support this, does yours?)
6 360x720 Yes
7 720x720 * Yes
* Notes for 720dpi printing:
----------------------------
As far as I can gather, the Stylus IIs can *not* actually print 720dpi. Someone
will have to let me know more about the Stylus II. Instead it achieves an
effective dot placement resolution of upto 1/720th of an inch by printing two
360dpi rasters offset by 1/720th of an inch as in the following diagram:
#.#.#.#.#.#.#.#.#.
.o.o.o.o.o.o.o.o.o # correspond to one 360dpi raster
#.#.#.#.#.#.#.#.#. o correspond to another
.o.o.o.o.o.o.o.o.o . is a gap
Strictly speaking the dpi value is sqr(2)*360 or a bit over 500dpi along the
diagonals. This means that exactly half of your image data is ignored when
printing with density 7.
This is the reason for the strange artifacts when using e.g. FS dithering at
720x720. I would recommend a step down to density 6 in these cases. I cannot
see any way around this shortcoming other than by bypassing the printer.device
altogether and incorporating the dithering software in the driver itself.
Author's Address
----------------
email: alex@warp.demon.co.uk
smail: Alex Tucker,
"Strawberry Fields",
Cliff Road,
Skipsea,
East Yorkshire.
YO25 8TF
UK
Please send bugs/praise/suggestions/chocolate cake. If the driver really changes
your life, you could always send a couple of quid/bucks/assorted change my way to
go towards the cost of the £40 ESC/P reference manual :)
Revision History
----------------
21-May-96: Initial beta released.
29-May-96: Removed mungwall hit reported by Andrea Latina. Oops.
16-June-96: After some feedback about the differences between the Stylus II and IIs
I have decided to reconfigure the driver to be more general.
Specifically, the driver outputs to a 4 colour Black/Yellow/Cyan/Magenta
model instead of the Black *or* YMC model on the IIs. The IIs is
intelligent enough to understand what's going on. In fact the only time
this might be inconvenient is if your printing software is good enough
to allow colour separation between the black/colour heads; let me know
if this is the case.
Some bugettes have been flattened and the code slightly improved, thanks
to Carl-Eric Menzel and Ken Pierce for their constructive critisisms :)