Hi Andy, Wolf & All,
I use the "Sunrise.pal" pallette & I would say the description below is
possibly what Wolf was trying to acheive there. But now the gauntlet has
been thrown down for the challenge.
Regards,
Gary - G4WGT - IO83qp
Web : http://myweb.tiscali.co.uk/wgtaylor
-----Original Message-----
From: [email protected]
[mailto:[email protected]]On Behalf Of Wolf DL4YHF
Sent: 31 January 2006 17:08
To: [email protected]
Subject: Re: LF: T/A JAN 31
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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