Dot Patterns; The Print Head And Graphics - Epson LX-90TM User Manual

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The quickest and easiest way to print graphics on your LX-90 is to
use a commercial graphics program. With such programs you usually
create an image on your monitor or TV screen and then give a com-
mand to send the image to the printer.
If you use commercial software that produces graphics, all you
need to know about dot graphics is how to use the software. If, on the
other hand, you wish to do your own programming or merely wish to
understand how the LX-90 prints graphics, read on.

Dot Patterns

Graphic images are formed on the LX-90 about the same way that
pictures in newspapers and magazines are printed. If you look closely
at a newspaper photograph, you can see that it is made up of many
small dots. The LX-90 also forms its images with patterns of dots, as
many as 240 dot positions per inch horizontally and 72 dots per inch
vertically. The images you print on the LX-90 can, therefore, be as
finely detailed as the one on the first page of this chapter.
If you plan carefully where you want the dots to appear and then
use or create a program
printer, your LX-90 will print almost any picture you can imagine.

The Print Head and Graphics

Chapter 3 told you a little about how the print head on the LX-90
prints letters: it receives a code for a letter and then fires a pattern of
pins to form that letter.
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