Halftone in PPage?
6 messages in this thread
What's the best way to print b&w photos for reproduction from PPage?
Traditionally, you would get a velox or halftone made of a photo and drop
it in, so how do I duplicate that process electronically?
I notice that there is a "Halftone" radio button in the DotMatrix print
requester, but, naturally, I'm printing postscript.
Any words of wisdom here?
Thanks – Joe
Joe,
What you want to do is scan the photos into an IFF file and drop them into
a box in PPage. At Transactor we used to use DigiView for some
illustrations. In fact, we used it to do the product package shot for
DigiView and most folks would never know that it wasn't a stripped-in
photo. I also used it in the 8-bit Transactor for an illustration of a
circuit board. Worked well! You could read the numbers printed on the
chips.
I think scanning would give you better resolution than a video capture but
a circuit board is tough to put in the scanner.
Malcolm
Malcolm –
Do you remember what lpi value you used? I'm trying to retain maximum
contrast for a black & white photo.
Thanks…
– Joe
I generally use a 133 line screen for the Lino and maybe 60 for a
laser proof. I don't really know what number is best for a laser and
they probably vary. I suppose that, as you go up the numbers, there's
some point where higher numbers don't result in any better image,
just longer output time.
Hi, both of you.
The screen you use for a halftone picture surely defines the detail
and therefore the quality of the picture you reproduce. But the
resolution of the output device in combination with the screen
frequency make up the possible numbers of colors reproduced. That
is, postscript is able to give you 256 colors (or shades of grey to
be exact). To display 256 colors, you need a matrix of 16×16. Given
the resolution of your printer you could easyly calculate the biggest
frequency you could use to get all colors possible. The other way
round: the higher the frequency you use, the lesser colors you'll
get!
… over the ocean
Jochen, Stuttgart, Germany with AutoPilot
Jochen,
Sorry, I don't follow. I need a matrix of 16×16? If my printer is 300dpi,
what formula do I use to calculate the number of screen lines?
Malcolm