Re: Advice on how to add the Epson SL-D700

Solomon Peachy <[email protected]> Sun, 8 Aug 2021 17:54:59 -0400
Newsgroups	gmane.linux.printing.gimp-print.devel
Message-ID	<[email protected]>
On Sun, Aug 08, 2021 at 01:22:45PM -0400, Solomon Peachy wrote:
>   <resolution translate="text" name="720x360sw" text="720 x 360">
>    <physicalResolution>720 360</physicalResolution>
>    <parameter type="integer" name="escp2_base_res">360</parameter>
>   </resolution>

FWIW, there's a special-case in adjusted_vertical_resolution() that seems to
things on this printer for 720x360.  I commented it out for now.

>     1b  (  g 04 00 30 2d 00 00   # sent after the "print method" and "dot size" commands

This turns out to be the cutter control, in units of 2880 rows/inch.  
Without it the printer cuts and stops after something like a single 
inch.

The good news is that with some hacked-in changes, I'm now able to 
print, and the color channels appear to be correct!  The bad news is 
that the ink drop/density levels are _quite_ wonky, but that was 
expected.

More seriously, there is a major page margin definition problem in play, 
and I'm not sure how to tackle it.

I think I need to add about an inch of vertical margin to start of the 
printed page, eg a 6x8" print becomes a 6x9", but with the first inch 
blank. This seems to jive with what I see in the windows dump, with the 
first vertical position command at position 1374:

   1b  (  v 04 00  5e 05 00 00   # == 1374

But from gutenprint it's this:

   1b  (  v 04 00 00 00 00 00

Interestingly, this extra inch-ish gets automatically cut off by the 
printer, and that explicit (g cutter control is relative to this first 
cut point, so as far as the user is concerned, what comes out is a 
perfect 6x8" print.

Is there a simple way to force-add this margin from within the escp2 
driver in a way that won't get reported back to the user as a page 
margin?

Thanks,

 - Solomon
-- 
Solomon Peachy			      pizza at shaftnet dot org (email&xmpp)
                                      @pizza:shaftnet dot org   (matrix)
High Springs, FL                      speachy (libra.chat)

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