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Re: costum stretch an image [message #68885 is a reply to message #68880]

Mon, 30 November 2009 10:16

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

ivitseva wites:

> Good mornig or evening everybody. I'm trying to solve this stretching
> issue for some time now, my attempts resulted in a huge mess...Please
> help!
> I'd like to stretch an image of 1 band using IDL or ENVI stretch_doit,
> whatever is the fastest. I need to script it for I'll need to do it
> with a huge number of images.
> My image is a floating point, the input range of values is 0.000000 to
> 76.021912 and the output should be integer.
> Now, the values 0.000000 till 36.0000 should be stretched into a range
> of -12 to -1, the values in the range of 37.0000 till 72.0000 should
> be stretched into a range of 0 till 36, and the values from 72.000000
> till 76.021912 should be in the range of 37 to 48.
> This might be a piece of cake but I just cannot manage it. I had tried
> to do it with stretch_doit but not being a programmer I am stuck with
> this quite easy task...so here is what I did till now but it is
> completely wrong for all these else-es and endelse-es and if-s and
> endif-s are wrong...

Here is how I would do a custom stretch of an image in
IDL. I don't know about ENVI. It should be possible to
write this as an ENVI image file, however.

http://www.dfanning.com/code_tips/partition.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 thue. ("Perhaps thos speakest truth.")

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[Message index]

		Re: costum stretch an image By: ivitseva on Wed, 02 December 2009 01:15
		Re: costum stretch an image By: David Fanning on Tue, 01 December 2009 11:18
		Re: costum stretch an image By: jeanh on Tue, 01 December 2009 10:02
		Re: costum stretch an image By: ivitseva on Tue, 01 December 2009 08:51
		Re: costum stretch an image By: ivitseva on Tue, 01 December 2009 08:45
		Re: costum stretch an image By: M. Katz on Mon, 30 November 2009 13:22
		Re: costum stretch an image By: David Fanning on Mon, 30 November 2009 10:16
		Re: costum stretch an image By: David Fanning on Mon, 30 November 2009 10:11

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