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Use r’s M anual
4- 13
Fix ed Processing: Used for black- and-
white and ot her high cont rast docum ent s. A
single level is set t o det erm ine the black-
and- whit e transit ion. The t hreshold is
program m able over t he ent ire density
range. Fixed Pr oce ssing set s Contrast t o
0. I f Fix ed Processing is select ed,
Contrast is not available.
Halft one: I n addit ion to t he black and
whit e display, Halft one can present a
som ehow gray shade of im age by using
different size of dots. Halft one im age looks
like the picture we have seen in t he
newspaper. Options include H a lftone 1 ,
Halft one 2 , Halft one 3 , Halft one 4 ,
Halft one 5 .
Er r or Diffu sion : Error Diffusion is a t ype
of Halftone. Error Diffusion gives good
im age t exture and m akes text in im ages
m ore readable than Halft one.
Halft one I m a ge
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