Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!sun!pepper!cmcmanis
From: cmcmanis%pepper@Sun.COM (Chuck McManis)
Newsgroups: comp.sys.amiga
Subject: Re: Question about 1084 monitor
Message-ID: <43538@sun.uucp>
Date: 29 Feb 88 19:11:28 GMT
References: <5093@pyr.gatech.EDU>
Sender: news@sun.uucp
Reply-To: cmcmanis@sun.UUCP (Chuck McManis)
Distribution: na
Organization: Sun Microsystems, Mountain View
Lines: 22
Keywords: 1084, hue, color, sharpness

In article <5093@pyr.gatech.EDU> gt4785b@pyr.gatech.EDU (CARTER) writes:
>I just received my replacement 1084 monitor.  In Analog RGB mode (i.e.
>connected to my A500) the Hue, Color, and Sharpness knobs have NO effect!
>But in Composite mode (connected to my VCR) Hue and Color work; Sharpness
>still has no effect.

Hmmm, where to start. The way color information is transmitted on a composite
signal is via phase information on a 3.58Mhz subcarrier. Hue and Color 
adjust the internal phase locked loop(s) to lock on at different phase points
so that the color on your monitor looks like you expect it to look. This
is an incredibly simplistic explanation, I know, there are several good 
books that cover this subject in detail. Look for descriptions of NTSC video,
color TV, and/or video signals. When you are using the RGB inputs the color
is preseparated and always 'correct' so these controls are non functional. 
Sharpness is usually a low pass filter in the video signal path that attenuates
rapid changes in intensity, the visual effect is fuzzieness. No, your 1084
isn't broken.


--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.