Envelope-to: dave@picks.force9.co.uk
Delivery-date: Tue, 31 Jan 2006 17:08:35 +0000
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Date: Tue, 31 Jan 2006 17:08:09 +0000
From: Wolf DL4YHF <dl4yhf@freenet.de>
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Subject: Re: LF: T/A JAN 31
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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 .