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Re: Stretching an image [message #41973 is a reply to message #41972]

Thu, 09 December 2004 11:01

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Julio writes:

> I'd like to know how to apply a stretch in an image using 2% of
> saturation. That's what ENVI does when I open any image.
>
> How can I do that using an IDL code?

I have no idea how ENVI does this, or even what
"2% of saturation" means, but I'm feeling reckless.
Here is how I would do it:

minImage = Min(image, Max=maxImage)
range = Float(maxImage) - Min(image)
onePercent = range * 0.01
low = minImage + onePercent
high = maxImage - onePercent
stretchedImage = BytScl(image, Min=low, Max=high)
TV, stretchedImage

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Re: Stretching an image By: Liam Gumley on Fri, 10 December 2004 10:41
		Re: Stretching an image By: David Fanning on Fri, 10 December 2004 08:33
		Re: Stretching an image By: Liam Gumley on Fri, 10 December 2004 07:14
		Re: Stretching an image By: David Fanning on Thu, 09 December 2004 13:36
		Re: Stretching an image By: KM on Thu, 09 December 2004 13:33
		Re: Stretching an image By: jnettle1 on Thu, 09 December 2004 11:51
		Re: Stretching an image By: David Fanning on Thu, 09 December 2004 11:01
		Re: Stretching an image By: KM on Fri, 10 December 2004 13:15

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