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Re: findng array[3] in array[3,n] [message #23474]

Fri, 26 January 2001 05:42

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"tbowers" <tbowers@nrlssc.navy.mil> writes:
>
... long description deleted ...
> colorIndex = where(eucDist EQ min(eucDist), count)
>
> ;set the alpha channel indices = 0 where theres black
> rgbaImage[3,colorIndex] = 0
>
> ;now it's readt for my IDLgrImage
> sState.oMapImage->setProperty, DATA=rgbaImage, HIDE=0
>
> Problem is is that my black is still opaque. I still can't see my objects
> behind it. Is it my misunderstanding of bringing this to 3D that's illing
> me?

Before you blame oMapImage, are you sure you actually got the alpha
channel you were hoping for?

One cool thing about the Euclidean distance thing is that you don't
have to take just the minimum distance. If you know that "black" can
be several nearby colors then you can say

colorIndex = where((eucDist-min(eucDist)) LT tol^2, count)

where tol is the number of deviant color levels you are willing to
accept. This helps especially in photographic pictures where solid
swatches are rarely a single color value.

Craig

--
------------------------------------------------------------ --------------
Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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[Message index]

		Re: findng array[3] in array[3,n] By: Craig Markwardt on Fri, 26 January 2001 05:42
		Re: findng array[3] in array[3,n] By: T Bowers on Thu, 25 January 2001 14:53
		Re: findng array[3] in array[3,n] By: davidf on Thu, 25 January 2001 09:48
		Re: findng array[3] in array[3,n] By: Craig Markwardt on Thu, 25 January 2001 09:30
		Re: findng array[3] in array[3,n] By: davidf on Thu, 25 January 2001 09:31
		Re: findng array[3] in array[3,n] By: John-David T. Smith on Thu, 25 January 2001 09:24

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