Re: [Gimp-print-devel] RE: Epson 1520 issues

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

   Date: Fri, 31 Mar 2000 21:24:07 -0800
   From: David Rosky <d_...@nc...>

   I have finally tried the 1.119 version and the results were 
   different but still not correct.  The magenta was horizontally 
   offset from the cyan and yellow (by about 2cm to the right) 
   and the density seems too low; however, the image was not
   expanded in the vertical dimension.  The speed is still
   many, many, times slower than 720dpi, apparently still
   printing one or two nozzles at a time, with the paper
   advancing microscopically between scans.

Hmm.  That's interesting.  How is the 720?  Is that correct?

   http://www.nccn.net/~w_rosky/dsr/e720.prn.gz
   http://www.nccn.net/~w_rosky/dsr/e1440.prn.gz

Thanks!

   1) I timed the printing of an image in the 1440 and 720 
   "microweave" modes.  The 1440dpi image took about four times 
   longer to print (head in motion continuously), which seems to 
   verify the assumption of two-pass printing.  At 1440, the paper 
   advances a small but visible amount between each scan of the 
   head, and the head definitely moves more slowly than in 720dpi 
   mode (somewhere around 1/2 speed), parhaps to allow increased
   settling time.

I know that some printers have multiple head speeds.

   2) A manually fed piece of paper actually backs up a bit
   before the printing starts.  Perhaps this is how they 
   attack the problem of vertical offset on the page.  I'm
   not sure if the driver or the application is doing this.

That happens on my EX, also.  Does it happen differently with the
plugin vs. Windows?