Re: [Gimp-print-devel] The Truth Behind ESC ( D

[Robert L K. <rl...@al...>]

   Date: Thu, 2 Mar 2000 19:24:12 -0500
   From: Karl Heinz Kremer <kh...@kh...>

   It looks like nL=3D64 an nH=3D56 it is very easy to create all the
   resolutions:

   v or h -> resolution
   120		1 / 120
   40		1 / 360
   20		1 / 720
   10		1 / 1440

   The static string in print-escp2.c uses a vertical resolution of=20
   1/360 and a horizontal resolution of 1/120.=20

I'm going to fix that using the information in the table (but I
probably won't test it beyond simply compiling it when I commit it).

   Is it possible that this is the reason why the STC740 has a
   MODEL_MAKE_XRES(360) in it's capabilities? This makes it impossible
   to get to the 'good' 1440dpi modes with this printer, whereas the
   640 does allow to use these modes. This is of course a bit unfair
   to the owners of the more expensive printer :-)

1440 dpi should still work on the 740...1440 dpi "highest quality"
won't, but 1440 dpi softweave with 360 horizontal resolution is the
same as 1440 dpi highest quality with 720 horizontal resolution.  It's
four passes either way, which should hide just about all banding.

   Is there anything I can try to prove this theory? I don't really
   understand what the driver is doing with all these different
   resolutions, so I probably need some theory first...

I'll try to write something up over the next few days...