Re: Resolution and Banding

[Peter Tattersall <ptatters@mac.com>]

If you print at 72 ppi then, yes, you will get a low res print even with 
a high printer resolution.

The main thrust of the thread concerns what happens as you increase the 
resolution of the file and it gets comparable to that of the print 
resolution. In principle you should see banding (or rather, moire 
patterns) when the file resolution gets close to the printer resolution. 
In practice I don't think you'll see it unless there is a regular 
pattern in the file itself. For example, if you are printing a 700 
line-per-inch document at 720 dpi you might see banding as a 20 lpi 
moire pattern. How prominent it would be depends on the angle of the 
lines with respect to the vertical and horizontal in the print, and on 
the dither pattern, etc. With photo prints the underlying photo image is 
usually 'random' enough that you don't see the moire pattern, but if you 
have a scan of a dot screen or if the image contains a number of lines 
in a fixed direction then the pattern might show up.

For myself, when I think of banding on my prints I am generally thinking 
of irregularities in dot placement rather than of anything caused by 
interference between printer res and image res.

On Monday, June 3, 2002, at 04:38  PM, John M. Roper wrote:
> What am I missing here? I have been under the impression that printer 
> resolution and file resolution are two completely different things; 
> that printer resolution is a measure of the density at which it lays 
> down dots of ink; and that, with Epson, any file information above 
> above 360 ppi is discarded. In other words, if I have a 72 ppi, 8 x 10 
> file, and I print it at the highest Epson setting (in my case 1440 x 
> 720), I would get a very faithfully reproduced low resolution print, 
> jaggies and all. Have I been mistaken or am I misinterpreting what is 
> being said in this thread?

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