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Re: Medical Imaging Question [message #16801 is a reply to message #16618]

Tue, 17 August 1999 00:00

Struan Gray
Messages: 178
Registered: December 1995

Senior Member

Pavel Romashkin (promashkin@cmdl.noaa.gov) writes:

> If the 4096 grayscale levels are needed for *visual*
> analyses then is it not possible to map them to color
> scale - I'd imagine a human eye should be able to
> recognize variety in color easier than in grayscale.

There's a technical problem, in that you need to find 4096
different points in colour space that can be represented on a monitor
(easy), which allow adjacent colours in the 12-bit table to be
differentiated by the human eye (fairly easy) and which form a
'logical' ordered series (oops).

However you solve that last hiccup, some of the transitions from
one level to the next end up being more obvious to the viewer than
others. Playing with a normal image and the built-in colour maps with
well-defined bands shows this nicely: some maps make certain features
really jump out at you, while others will emphasise something
completely different. When done right it can be an aid to
visualisation, but unless you allow the user to fiddle in realtime,
you need to know which density areas are most important before you
start.

Struan

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[Message index]

		Medical Imaging Question By: davidf on Thu, 05 August 1999 00:00
		Re: Medical Imaging Question By: pford on Wed, 11 August 1999 00:00
		Re: Medical Imaging Question By: Struan Gray on Mon, 09 August 1999 00:00
		Re: Medical Imaging Question By: levick on Sun, 08 August 1999 00:00
		Re: Medical Imaging Question By: Struan Gray on Fri, 06 August 1999 00:00
		Re: Medical Imaging Question By: Struan Gray on Fri, 06 August 1999 00:00
		Re: Medical Imaging Question By: m218003 on Mon, 16 August 1999 00:00
		Re: Medical Imaging Question By: David Fenyes on Fri, 13 August 1999 00:00
		Re: Medical Imaging Question By: edward.s.meinel on Wed, 18 August 1999 00:00
		Re: Medical Imaging Question By: Peter Clinch on Wed, 18 August 1999 00:00
		Re: Medical Imaging Question By: Struan Gray on Tue, 17 August 1999 00:00
		Re: Medical Imaging Question By: davidf on Tue, 17 August 1999 00:00
		Re: Medical Imaging Question By: Pavel Romashkin on Tue, 17 August 1999 00:00
		Re: Medical Imaging Question By: davidf on Tue, 17 August 1999 00:00
		Re: Medical Imaging Question By: steinhh on Tue, 17 August 1999 00:00
		Re: Medical Imaging Question By: Patrick V. Ford on Mon, 16 August 1999 00:00
		Re: Medical Imaging Question By: davidf on Mon, 16 August 1999 00:00

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