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Re: Function BYTSCL [message #24641 is a reply to message #24637]

Tue, 10 April 2001 06:55

davidf
Messages: 2866
Registered: September 1996

Senior Member

Steffen Kernchen (steffen.kernchen@student.uni-magdeburg.de) writes:

> *g* no, it is a condition for a given exercise.
> it�s for my first program, i�ve to write for a new lecture at my
> university.
> so the answer for my question should be quite simple. just 3 or 4 lines...
>
> do you have an idea?

No. Not really. :-)

This seems like a strange course. "Contrast" is a visual
property. It pertains to how something is *displayed*,
which always involves bytes sooner or later.

If you want to do something to improve contrast to an
array, I suppose you can multiply the array by some
non-linear spreading function, then "normalize" it
into the range 0 to 255, if you prefer not to use the
term "byte scale". (I guess something like
this is done with histogram equalization, come to think
of it.) Perhaps we should just wait for JD to provide
the HISTOGRAM solution. (He isn't the guest lecturer,
is he?)

Cheers,

David

P.S. Let's just say I'm glad I'm not taking an IDL
programming class. :-(

--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@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]

		Re: Function BYTSCL By: marc schellens[1] on Tue, 10 April 2001 18:20
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 16:43
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 10:18
		Re: Function BYTSCL By: Jaco van Gorkom on Tue, 10 April 2001 09:37
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 08:10
		Re: Function BYTSCL By: Liam E. Gumley on Tue, 10 April 2001 07:44
		Re: Function BYTSCL By: Steffen Kernchen on Tue, 10 April 2001 07:42
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 07:30
		Re: Function BYTSCL By: Jaco van Gorkom on Tue, 10 April 2001 07:18
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 06:55
		Re: Function BYTSCL By: marc schellens[1] on Tue, 10 April 2001 03:08
		Re: Function BYTSCL By: Steffen Kernchen on Tue, 10 April 2001 03:51
		Re: Function BYTSCL By: davidf on Tue, 10 April 2001 03:17

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