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Delivery-date: Tue, 31 Jan 2006 19:47:50 +0000
From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
To: rsgb_lf_group@blacksheep.org
Date: Tue, 31 Jan 2006 19:43:48 -0000
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Subject: RE: LF: Colour Pallette
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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: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Wolf DL4YHF
Sent: 31 January 2006 17:08
To: rsgb_lf_group@blacksheep.org
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 .