halftoning spot function

Article View: comp.lang.postscript

Article #95

Back to comp.lang.postscript Previous Next

#95

From: Jon Everett
Date: Sun, 01 Nov 1992 21:22

21 lines
1224 bytes

Question:

Can anyone provide a decent explanation of how
the 'spot function' works in halftoning?  From what I have
read in the Adobe Books, the function is supposed to take
x,y coordinates of a pixel in the halftone cellbox as arguments.
To me this is counter-intuitive. I would expect it to take a
gray value as input and return the bitmap of the cellbox.
Can anyone provide, or point me to, a fuller explanation of 
the spot function's operation and its palce in the larger 
context of halftoning?  I would like to be able to explicitly
define the order in which the pixels in a cellbox of a given
size are turned on.


-- 
==============================================
Jon Everett  
Univ. of Maine 
fishboy@gandalf.umcs.maine.edu

Technical Details

Message-ID: <1992Nov1.212253.16619@gandalf.UMCS.Maine.EDU>

Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!mars.caps.maine.edu!gandalf!fishboy

Show Full Headers

Complete Article Headers

Newsgroups: comp.lang.postscript
Path: arc1-ca.pugleaf.net!sparky!uunet!noc.near.net!mars.caps.maine.edu!gandalf!fishboy
From: fishboy@gandalf.UMCS.Maine.EDU (Jon Everett)
Subject: halftoning spot function
Message-ID: <1992Nov1.212253.16619@gandalf.UMCS.Maine.EDU>
Keywords: spot function, halftoning, setscreen
Sender: news@gandalf.UMCS.Maine.EDU (The paper boy)
Organization: University of Maine Department of Computer Science
Date: Sun, 1 Nov 1992 21:22:53 GMT
Lines: 22