Re: Grey Pictures, was: HP scanners 2200c vs 3500c vs 5300c?

"Robert Jasiek" <jasiek@xxxxxxxx> wrote in message
news:2efqj31b9hpm6dvavke06gv004u05fmth0@xxxxxxxxxx
On Fri, 16 Nov 2007 02:30:23 GMT, "CSM1" <nomail@xxxxxxxxxxxxxx>
wrote:
Is this so also for grey-scale pictures in books if the pictures have
a great variety of grey tones within a small contrast range?
8 bit output is sufficient for most uses for Grayscale pictures.

In a graphics program, I have reduced the number of bits to 8 for some
pictures with the characteristics above. It does make a difference -
usually only small but even that can simplify the picture too much
(for my purpose). I wonder though whether it would help to scan the
grey pictures as if they were coloured? 24 bit RGB is enough for me in
graphics editors. Does this necessarily imply that a so called 48 bit
(depth of colours) scanner would do the job? Or is, as you seem to
indicate with respect to the Moire effect, not the scanner hardware
but the driver software decisive?

If I should decide to buy an A4 scanner with 8 bits for grey, then I
am considering the HP G4050. Is this choice appropriate or is, as
someone has said, the driver software of HP scanners simply too weak?

I am the one that said HP software "stinks".

The HP G4050 is as good as any scanner, as I said before, the HP hardware is
fine, just the software is not up to par. It is about the same equivalent
hardware as the Canon 8800F. Price is about the same price.

It does make a difference anytime you reduce the bits of resolution, It
really depends on the original art work, Graphics can be very demanding on a
scanner. Graphic art is a whole another subject when it comes to scanners.

Grayscale vs Line art?
http://www.scantips.com/basics4f.html

Photographic Resolution
How much can we scan?
http://www.scantips.com/basics08.html

Moiré comes from the interaction of the tiny dots of the Contact Screen that
is used to be able to print a continuous tone picture. It is made up of
small dots, which you can see with a magnifying glass. Look at a magazine
picture with an 8 power loupe and you can see the individual dots.

Those dots are what the scanner sees.

48 bit color is equivalent to the 16 bit grayscale scanning. It is 16 bits
each of Red, Green and Blue.
24 bit color converted to grayscale is the same 8 bit grayscale, you do not
get any extra resolution by scanning grayscale in color. You just triple the
file size.

--
CSM1
http://www.carlmcmillan.com
--


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