Re: Early PET fosphor colour

From: William Levak <wlevak_at_SDF.ORG>
Date: Fri, 20 May 2022 07:21:19 +0000 (UTC)
Message-ID: <Pine.NEB.4.64.2205200700310.4522_at_sdf.org>
The original PET monitor was a standard white monochrome picture tube. 
The exact shade of white depended on the manufacturer. Viewing pictures 
on a current color monitor is subject to all the effects caused by viewing 
an analog image on a digital monitor. Analog monochrome monitors have a 
continuos layer of phosphor. Digital color monitors have triplets of color, 
spaced regularly on the surface. A common effect is fringing (edges of 
letters come out as a different color because the width of letters are not 
integer multiples of the color triplets). Another effect causes the 
letters to be irregular in shape. This comes from the fact that the image 
must be scaled to fit a different resolution monitor. In the scaling 
process causes some lines of image are dropped because of rounding 
errors.

On Thu, 19 May 2022, Rhialto wrote:

> Do we know which colour the original (pre-green) PET monitors had?  From
> memory I'd call it blue-ish white.
>
> You can see it on various YouTP9y_7it3ZMube videos (such as
> https://www.youtube.com/watch?v=eP9y_7it3ZM at around 7:20), but I
> wouldn't trust the colour balance on youtube videos too much.
>
> At a guess it would be somewhere near r/g/b/ AA/AA/FF, but can we get
> more precise?
>
> -Olaf.
> -- 
> ___ "Buying carbon credits is a bit like a serial killer paying someone else to
> \X/  have kids to make his activity cost neutral." -The BOFH    falu.nl_at_rhialto
>

wlevak_at_sdf.org
SDF Public Access UNIX System - http://sdf.org
Received on 2022-05-20 10:00:08

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