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Re: LF: T/A JAN 31

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Subject: Re: LF: T/A JAN 31
From: Wolf DL4YHF <[email protected]eenet.de>
Date: Tue, 31 Jan 2006 17:08:09 +0000
Delivery-date: Tue, 31 Jan 2006 17:08:35 +0000
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Greetings all...

Andy wrote:

A professional programmer who spent somef time working on waterfall palettes
for signal analysis once suggested that, it order to see signals separated
from the background by only a small amount, a waterfall should change
brightness rapidly and colour more slowly, even if some brightness levels
repeat over the dynamic range.  Working on the basis that most interest is
in weak signal resolution, and stong ones can be left to fend for
themselves,  he suggested a palette that ran from dark blue, through red to
yellow then back via green and orange to black.  (Or other  variants like
this) .  A bit weird but brightness as perceived by the eye is then peaked
part way up the signal range.

The dark blue could then be placed at the noise level, so the normal noise
spikes averaging 2 - 4dB above mean, say, would push towards red (also a
dark colour), but signals at 6 - 10dB S/N would show clearly as bright
centre optical-spectrum green/yellow.   Really strong sigs would be
orange/black but would not be hidden as they'd have brightly coloured
sidebands making them stand out against their own background.  I never tried
it - but may do now the idea has been awakened.

Andy   G4JNT
www.scrbg.org/g4jnt/

Thanks Andy - any volunteer among the SpecLab users who already realized this with the colour palette editor ? If so, I'd like to add it in the next release so others can try it out too ;-)
73,  Wolf  DL4YHF .


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