Re: Resolution and Banding

[Kennedy McEwen <rkm@kennedym.demon.co.uk>]

In article <5a.c4b0ef0.2a2bfddf@aol.com>, HMSDOC@aol.com writes
>This may be a naive question...but does this mean that if you have the data
>available from high resolution scanning that the best print results would be
>obtained by sending the printer an image at 720 or 1440 ppi rather than 300
>or 360?
>
If you have that much data available then you should certainly send it 
at the resolution that the printer will resample to which is, as 
previously said, the lower of the dpi figures - ie. 720dpi.

This assumes that your image is fairly clean and noise free.  The dot 
placement algorithm tries to retain as much of the fine detail in the 
image as possible at the expense of perfect tonal reproduction in the 
detail - the tonal errors are averaged out over many dots.  Consequently 
the contrast of the fine detail is stretched to the ink tonal 
separations and image noise can be exaggerated by this, but this can 
usually be controlled by application of a slight gaussian blur filter to 
eliminate the noise.
-- 
Kennedy
Yes, Socrates himself is particularly missed;
A lovely little thinker, but a bugger when he's pissed.
Python Philosophers
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