🚀 go-pugleaf

In article <865507489wnr@ttelmah.demon.co.uk>, Roger Hamlett
<roger@ttelmah.demon.co.uk> writes

> You have to also seriously consider what output device
>you are going to use. A laser, or inkjet printer, may have a nominal
>300*300 point resolution, (or more), but this is only of on/off dots.

I don't know that that's true any more. I think some HP devices describe
having 128 grey levels. I assume that this is per pixel.

I don't see that it's any big deal for them to modulate the laser beam
in a linear way.


>To print a picture, patterns of these dots are used to reproduce
>various intensity levels, and this is where the big difference exists
>in the printing industry, where quite high quality photographs are
>only printed with a 'mask' of 100 to 120DPI, but each 'dot', can be
>itself, any of many thousands of different sizes, to give good
>colour/intensity reproduction. A 300 DPI laser printer, will only
>be able to give a reasonable number of different dot patterns, at
>30-45DPI, which is why pictures printed this way, look relatively
>poor.

Hmmmm. I once wrote routines to dither satellite weather pictures onto a
Toshiba 1350 dot matrix printer. See a 286 quiver with anticipation !

It worked pretty well though...

-- 
John Beardmore