Paxar 9402, 9403 E r v i e w o f B i t m a p p e d I m a g e s, T e r m i n i n g a M e t h o d

O v e r v i e w o f B i t m a p p e d I m a g e s

A printed image is formed through a series of dots. Each square on the grid below represents a dot on the printhead. The graphic image is created by blackening dots in a specific pattern. You can print varying shades of gray according to the concentration of dots on the image. When the dots are printed together, the end result is a graphic image.

D e t e r m i n i n g a M e t h o d

You can use one of two methods to map out your graphic image:

Hex Method	The dot sequences are segmented into binary
	numbers, and then converted to hex numbers.
	A graphic using gray-scaling, several slanted
	lines, or several vertical lines typically
	translates more efficiently with hex
	representation.
Run Length	The dot sequences are segmented into black
Encoding Method	and white strings within a row. The total
	count of each white string is converted to a
	lower-case letter, corresponding to numeric
	value. The total count of each black string is
	converted to an uppercase letter,
	corresponding to numeric value. This method
	can reduce imaging time for graphics that
	contain repetitive rows of dots. A graphic
	with horizontal lines or very few
	white-to-black borders typically translates
	more efficiently with run length encoding.

Creating Graphics 5-3