Re: 256 levels of gray
Re: 256 levels of gray
- Subject: Re: 256 levels of gray
- From: email@hidden
- Date: Wed, 16 Jul 2003 12:59:06 EDT
In a message dated 7/16/03 12:44:47 PM, email@hidden writes:
>
>
Do laser printers have 256 levels of gray with their halftone cells, or
>
256 levels of gray as part of the pure engine marking capabilities
>
(before halftoning)? Or someting else?
>
Most lasers offer far fewer than 256 distinguishable grays on their actual
prints... the more expensive ones offering more levels than the lower cost
ones.
As for the intent as opposed to the measurable result, they take the 256
levels of gray in a grayscale or color file, and dither it into something a
bit
less fixed then cells (at least those devices using modern diffusion
algorithms). These flexible sized psuedo-cells offer fewer levels but more
detail in high
contrast areas, and more levels but less detail in low contrast areas. This
makes simple math comparing cell size to number of levels less direct, but
with
access to the code, and assuming max cell size, one could certainly determine
maximum numbers of possible levels. However, such processes as shaking toner
on a belt, dumping it onto paper, and heat-fusing it there, would tend to
obscure the actual results in a way that inkjet printing does not.
C. David Tobie
Design Cooperative
email@hidden
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