home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Amiga Plus 1995 #5 & #6
/
Amiga Plus CD - 1995 - No. 5 and 6.iso
/
pd
/
grafik
/
lightwave
/
lightwave-jan95
/
000321_owner-lightwave-l _Thu Jan 26 22:41:19 1995.msg
< prev
next >
Wrap
Internet Message Format
|
1995-02-04
|
3KB
Return-Path: <owner-lightwave-l>
Received: by mail.netcom.com (8.6.9/Netcom)
id RAA02002; Thu, 26 Jan 1995 17:40:38 -0800
Received: from Hydro.CAM.ORG by mail.netcom.com (8.6.9/Netcom)
id RAA01806; Thu, 26 Jan 1995 17:39:08 -0800
Received: from Stratus.CAM.ORG by Hydro.CAM.ORG with ESMTP id UAA10235
(8.6.9/8.6.9); Thu, 26 Jan 1995 20:39:37 -0500
Received: by Stratus.CAM.ORG with PINE id UAA01881
(8.6.9); Thu, 26 Jan 1995 20:40:57 -0500
Date: Thu, 26 Jan 1995 20:40:55 -0500 (EST)
From: Daniel Thomas <dthomas@CAM.ORG>
X-Sender: dthomas@stratus
To: Ernie Wright <ernie@gaspra.pd.com>
cc: lightwave-l@netcom.com
Subject: Re: Too Hot color LW SA
In-Reply-To: <Pine.SUN.3.91.950125231321.12742B-100000@gaspra.pd.com>
Message-ID: <Pine.SOL.3.91.950126203141.1628B-100000@stratus>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-lightwave-l@netcom.com
Precedence: bulk
On Wed, 25 Jan 1995, Ernie Wright wrote:
> I'm not a video expert, but this looks more like a client attitude
> problem than anything else (for all the good that does you). Colors
> aren't usually considered too hot until they're over 110 IRE, and in
> any case what the waveform looks like isn't as important as whether
> clipping is really visible on the screen of a composite monitor--hot
> colors are often cooled by the encoder anyway.
Colors are not measured by IRE, video levels are.
>
> Software that cools image colors usually isn't very subtle, with the
> result that there's an undesireable loss of either saturation or
> contrast. If you have to deal with a client who's overly concerned
> with hot colors, it's better to avoid generating them in the first
> place. Stay away from fully saturated cyan and yellow in particular.
>
> But I've never worried much about it. The hardware has always handled
> whatever I've given it.
Well I don't agree with your opinion. a 110 % IRE can cause many
problem, specially for satellite broadcast. There are specifications and
it is VERY important to follow them. Otherwise, manufacturers won't
produce vectorscope and waveform monitor.
Actually the Video Toaster is very accurate. I never have problem with
luma and chroma level. But improper cables and connections, terminators,
etc. can cause that can of problem.
Primary colors can cause problem if they are full saturated, but as I
said, the framestores from Lightwave never do that (not yet!). Hot color
may happen with ToasterPaint. Be carefull.
One trick is to never put the RGB level more than 220. If you want to be
safe, let's say 200.
So when people says that video is 16.7 millions color, it's not really true!
Daniel Thomas
dthomas@CAM.ORG