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-<HTML>
-<HEAD>
-<!-- This HTML file has been created by texi2html 1.51
- from .././gimpprint.texi on 11 June 2004 -->
-
-<TITLE>GIMP-Print - Weaving algorithms</TITLE>
-</HEAD>
-<BODY>
-Go to the <A HREF="gimpprint_1.html">first</A>, <A HREF="gimpprint_27.html">previous</A>, <A HREF="gimpprint_29.html">next</A>, <A HREF="gimpprint_47.html">last</A> section, <A HREF="gimpprint_toc.html">table of contents</A>.
-<P><HR><P>
-
-
-<H2><A NAME="SEC43" HREF="gimpprint_toc.html#TOC43">B.2 Weaving algorithms</A></H2>
-<P>
-<A NAME="IDX184"></A>
-
-</P>
-<P>
-I considered a few algorithms to perform the weave. The first one I
-devised let me use only @math{(jets-distance_between_jets+1)}
-nozzles, or 25. This is OK in principle, but it's slower than using all
-nozzles. By playing around with it some more, I came up with an
-algorithm that lets me use all of the nozzles, except near the top and
-bottom of the page.
-
-</P>
-<P>
-This still produces some banding, though. Even better quality can be
-achieved by using multiple nozzles on the same line. How do we do
-this? In 1440x720 mode, we're printing two output lines at the same
-vertical position. However, if we want four passes, we have to
-effectively print each line twice. Actually doing this would increase
-the density, so what we do is print half the dots on each pass. This
-produces near-perfect output, and it's far faster than using (pseudo)
-"MicroWeave".
-
-</P>
-<P>
-Yet another complication is how to get near the top and bottom of the
-page. This algorithm lets us print to within one head width of the
-top of the page, and a bit more than one head width from the bottom.
-That leaves a lot of blank space. Doing the weave properly outside of
-this region is increasingly difficult as we get closer to the edge of
-the paper; in the interior region, any nozzle can print any line, but
-near the top and bottom edges, only some nozzles can print. We
-originally handled this by using the naive way mentioned above near
-the borders, and switching over to the high quality method in the
-interior. Unfortunately, this meant that the quality is quite visibly
-degraded near the top and bottom of the page. We have since devised
-better algorithms that allow printing to the extreme top and bottom of
-the region that can physically be printed, with only minimal loss of
-quality.
-
-</P>
-<P>
-Epson does not advertise that the printers can print at the very top
-of the page, although in practice most of them can. The quality is
-degraded to some degree, and we have observed that in some cases not
-all of the dots get printed. Epson may have decided that the
-degradation in quality is sufficient that printing in that region
-should not be allowed. That is a valid decision, although we have
-taken another approach.
-
-</P>
-
-<UL>
-<LI><A HREF="gimpprint_29.html#SEC44">Simple weaving algorithms</A>: Starting to weave.
-<LI><A HREF="gimpprint_30.html#SEC45">Perfect weaving</A>: Improving the weave.
-<LI><A HREF="gimpprint_31.html#SEC46">Weaving collisions</A>: Bang!
-<LI><A HREF="gimpprint_32.html#SEC47">What is perfect weaving?</A>: What makes a "perfect" weave?
-<LI><A HREF="gimpprint_33.html#SEC48">Oversampling</A>: Increasing resolution, reducing banding
-</UL>
-
-<P><HR><P>
-Go to the <A HREF="gimpprint_1.html">first</A>, <A HREF="gimpprint_27.html">previous</A>, <A HREF="gimpprint_29.html">next</A>, <A HREF="gimpprint_47.html">last</A> section, <A HREF="gimpprint_toc.html">table of contents</A>.
-</BODY>
-</HTML>