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Re: Fanning's LogScl routine + Colorbar?? [message #71830]

Sat, 24 July 2010 08:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Joe Daal writes:

> I am using the logscl to enhance the contrast of an image, something
> like:
>
> loadct,39
> image = alog10(lin_image)
> imdisp, logscl(image, min=min(image), max=max(image), Exponent=8,
> Mean=0.65)
>
> where image values vary from -1.34 to +2.05, with zeroes included.
> The image looks nice for what I want, but how do I reflect a correct
> colorbar, either for real values or the scaled ones? What is
> logarithmic, the ticks or the colors?

After thinking about this some more this morning, I decided
I would write an article about it. Normally, when I write an
article I am about 90% sure I know what I'm talking about.
(My wife says I have been overly optimistic my whole life!)

In this case, it's more like 50%. But I figure the worst
thing that could happen to me would be that I might learn
something. ;-)

You can find the article here:

http://www.dfanning.com/ip_tips/logscaledbar.html

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Fanning's LogScl routine + Colorbar?? By: David Fanning on Sat, 24 July 2010 08:40
		Re: Fanning's LogScl routine + Colorbar?? By: David Fanning on Fri, 23 July 2010 13:32
		Re: Fanning's LogScl routine + Colorbar?? By: pgrigis on Fri, 23 July 2010 13:10
		Re: Fanning's LogScl routine + Colorbar?? By: pgrigis on Fri, 23 July 2010 12:53
		Re: Fanning's LogScl routine + Colorbar?? By: pgrigis on Fri, 23 July 2010 12:51
		Re: Fanning's LogScl routine + Colorbar?? By: David Fanning on Fri, 23 July 2010 12:38
		Re: Fanning's LogScl routine + Colorbar?? By: pgrigis on Fri, 23 July 2010 10:46
		Re: Fanning's LogScl routine + Colorbar?? By: pgrigis on Mon, 26 July 2010 07:59
		Re: Fanning's LogScl routine + Colorbar?? By: Joe Daal on Wed, 28 July 2010 20:47

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