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Re: Image scale as 0 - 4096 instead of 0 - 255 [message #29942 is a reply to message #29908]

Tue, 26 March 2002 17:35

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Akhila (idlfreak@yahoo.com) writes:

> I hope i'm clear this time.

I think Mark solved this one for you. You can have as many
object windows as you like. Set the RETAIN keyword so they
do their own backing store and redraw properly.

> I'm sorry to bother you, but i have another question to ask you. I saw
> that you have once discussed about dispaying the image for Medical
> imaging purposes using 4096 as a greyscale instead of 255. Is that
> possible and how can you do that?

I didn't say 4096 shades of gray. I said that often medical
images are 12 or 16 bit rather than 8 and radiologists don't
want to throw *any* data away. So they prefer to define a
"window" into their 16-bit data and choose which range of
the data is displayed in the 256 shades of gray available
on a computer.

The program ConstrastZoom on my web page demonstrates one
way this windowing can be done (among other things).

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Image scale as 0 - 4096 instead of 0 - 255 By: idlfreak on Fri, 22 March 2002 12:18
		Re: Image scale as 0 - 4096 instead of 0 - 255 By: David Fanning on Tue, 26 March 2002 17:35
		Re: Image scale as 0 - 4096 instead of 0 - 255 By: Mark Hadfield on Tue, 26 March 2002 16:45
		Re: Image scale as 0 - 4096 instead of 0 - 255 By: idlfreak on Tue, 26 March 2002 14:38
		Re: Image scale as 0 - 4096 instead of 0 - 255 By: David Fanning on Tue, 26 March 2002 09:43

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