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Re: List of Points --> ROI via IDLVECTOR data type for iimage itool [message #45816 is a reply to message #45815]

Thu, 13 October 2005 13:15

David Alexander
Messages: 26
Registered: August 2005

Junior Member

Edward,

You want to display the pixels from the image after you run your
sampling routine, right?

After your sampling routine, do you end up with 3 vectors (x, y,
pixels)? If so you could either pass them directly into iImage (iimage
can take 3 vectors as input, but it will force you to grid the data),
or you can generate an image array with an alpha channel (RGBA) based
on your pixel data, and set the Alpha channel value for all the unused
pixels to 0. So, something like this:

pro test
imagePixels = randomu(s,1000)
x = bytscl(randomu(s,1000))
y = bytscl(randomu(s,1000))

newImage=fltarr(max(x)+1,max(y)+1)
newAlpha=fltarr(max(x)+1,max(y)+1)
newImage[x,y]=imagePixels
newAlpha[x,y]=255
newImage=[[[newImage]],[[newImage]],[[newImage]],[[newAlpha] ]]

iimage,newImage
end

My sample data is not RGB, so I triplicated the newImage variable. If
you already have RGB pixels, you won't need to do that.

Dave

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[Message index]

		Re: List of Points --> ROI via IDLVECTOR data type for iimage itool By: David Alexander on Fri, 14 October 2005 10:40
		Re: List of Points --> ROI via IDLVECTOR data type for iimage itool By: MarioIncandenza on Thu, 13 October 2005 15:08
		Re: List of Points --> ROI via IDLVECTOR data type for iimage itool By: David Alexander on Thu, 13 October 2005 13:15

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