🚀 go-pugleaf

In article <32517@darkstar.ucsc.edu> (comp.sys.mac.apps), capri@ucscb.UCSC.EDU (71062000) writes:
>
>More specifically, how about a 300dpi editor that handles bitmaps at
>that level?  Probably not.  I just want to be able to edit scanned 
>images.

Photoshop can handle editing scanned images.  It doesn't much care
about the resolution of the image (I regularly scan 4000 dpi images
into PS).  PS can handle bitmaps too, although it is really more for
colour work.

>Also, how about grey-scale printers?  Anyone know if the StyleWriter will
>print at various greyscales?  Probably not?  How about LaserWriters?

Don't know, never used a StyleWriter.  LaserWriters (I assume that
this is also true with the StyleWriters) cannot print grey.  They
are limited to black and white.  The Dot is either there, or it isn't
(NB: this may not be 100% accurate with the new LaserWriters).

*HOWEVER*

There is a process where you take a group of dots (often a 5 * 5 matrix,
but any size can be used), call that group one dot.  Then, you have
several levels of grey (25, if you use a 5*5 matrix, etc).  Frequently,
you will hear the high end image people talking about "line screen".
A 60 line screen, with a 300 dpi printer gives you 60 "dots" per inch,
each with 25 levels of grey.  Your monitor, on the other hand, can
usually display 256 levels of grey per pixel, but at about 72 dpi.
An image scanned in by a good (low end) scanner can scan 300 dpi,
with 256 levels of grey per channel (e.g. if it is colour, each pixel
scanned has 16M possible colours.  16M = 256 red * 256 green * 256
blue) (some of the cheaper scanners may not give a full 8 bits / channel.
One made by Sharp a few years ago gave about 6.5 bits)

Essentually, if you only have a 300 dpi printer, and you are scanning
in greyscale, you are really just wasting time scanning you original
in at 300 dpi -- 120 dpi should be sufficient for a 60 line screen.
The rule is:

	scanner resolution = line screen * magnification(e.g. 1x, 2x, etc) * 2

+C



>
>Jeffrey WonderingAloudAboutTheLatestTechnology Osier, aka capri@ucscb.ucsc.edu
>
>
>


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