Path: utzoo!utgpu!watmath!clyde!att!ucbvax!decwrl!labrea!polya!ali
From: ali@polya.Stanford.EDU (Ali T. Ozer)
Newsgroups: comp.sys.next
Subject: Re: how many graylevels on NeXT screen?
Message-ID: <6005@polya.Stanford.EDU>
Date: 10 Jan 89 15:34:07 GMT
References: <3131@dalcs.UUCP>
Reply-To: aozer@NeXT.com (Ali Ozer)
Distribution: na
Organization: .
Lines: 14

In article <3131@dalcs.UUCP> kelley@dalcs.UUCP (Dan E. Kelley) writes:
>I have a simple question: How many graylevels does the NeXT screen display?

NeXT screen has 4 true grays; 2 bits/pixel. Using Postscript
halftoning, the screen is capable of displaying many more shades of
gray. Most system grays (icons, window borders/buttons, menus) however
are made with the pure grays for a sharp look.

Each pixel can also have 2 bits/pixel of alpha for transparency.
In some cases, the transparency is stored implicity (eg, the whole
window is opaque, or alpha = data for the whole window) to save memory.

Ali Ozer, NeXT Developer Support
aozer@NeXT.com