comp.lang.idl-pvwave archive: archive » Re: Medical Imaging Question

Home » Public Forums » archive » Re: Medical Imaging Question

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Medical Imaging Question [message #16599 is a reply to message #16578]

Thu, 05 August 1999 00:00

Axel vom Endt
Messages: 9
Registered: March 1999

Junior Member

David Fanning wrote:
>
> I mean by this that I want to "see" 4094 shades of gray.

I'm not sure about the reference for this, but I read somewhere that the
human eye cannot even distinguish between 256 levels of gray. Isn't that
the reason to use the fancy color tables in IDL?

From what I understand about medical imaging the 4096 levels are meant
to have some headroom, so that you can zoom into some parts of the
intensity range to enhance certain features of the image without losing
resolution.

I think that these fudged gray scales have only been used in the old
days of the PC, when you had to use 256 colors out of 262144 on your VGA
card, i.e. 2^6 different shades each of r,g,b and therefore only 64
levels of pure gray. I've done that once, but the results haven't been
impressive.

Hope that helps

Axel

Report message to a moderator

[Message index]

		Re: Medical Imaging Question By: davidf on Fri, 06 August 1999 00:00
		Re: Medical Imaging Question By: Larry Busse on Fri, 06 August 1999 00:00
		Re: Medical Imaging Question By: davidf 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: Axel vom Endt on Thu, 05 August 1999 00:00
		Re: Medical Imaging Question By: davidf on Thu, 05 August 1999 00:00
		Re: Medical Imaging Question By: mirko_vukovic on Thu, 05 August 1999 00:00

Previous Topic:	SAVEIMAGE update
Next Topic:	Re: external c shared libraries

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 10:42:29 PDT 2025

Total time taken to generate the page: 0.96012 seconds