Message-Id: <199801292153.OAA29962@dns.ccit.arizona.edu> Date: Thu, 29 Jan 1998 16:50:55 -0500 From: James Anderson <mailto:jcande01@GWISE.LOUISVILLE.EDU> Subject: Re: B/W halftones To: mailto:IMAGELIB@LISTSERV.ARIZONA.EDU
A very good (short) book on this subject is "Making Digital Negatives for Contact Printing" by Dan Burkholder (Bladed Iris Press, 1995). Good discussions of all the controls you'll need to be familiar with to get the best results. Another good presentation of controls is found in "Scanning the Professional Way" by Sybil and Emil Ihrig (Osborne McGraw-Hill, 1995.) The Ihrig book is available (discounted) from Amazon (http://www.amazon.com). The Burkholder book may be harder to find.James C. Anderson Photographic Archives Special Collections Ekstrom Library University of Louisville Louisville, KY 40292 502/852-6752 502/852-8734 FAX mailto:jcande01@gwise.louisville.edu
>>> Joel Wolfson <mailto:DigiWolf@AOL.COM> 01/29 2:49 PM >>>
>We have many technological options for writing the data, but right
now >the easiest and most reliable way to write data is in black and
white, >as opposed to grayscales. Currently, that limits us to text, but I
>would like to do some experiments writing photographs as half-tones.
>I'd like to know if anybody has suggestions as to how I can
accurately >convert a grayscale photograph to halftone. For example, I tried
>changing the attributes in the Paint program to black and white, but
got >very unsatisfactory results. Is there a program that does this
>conversion, with user options? How do, for example, newspapers do
this >conversion?
Yes, PhotoShop allows for halftone conversions. You can even set the frequency, screen angle, and dot shape.
Hope this helps.
Optidigitally Yours,
Joel Wolfson Calumet Digital Solutions E-mail: mailto:digiwolf@calumetdigital.com or mailto:digiwolf@infomagic.com