| Overlay a coloured boundary on a gray scale image [message #81659] |
Thu, 11 October 2012 04:46  |
titan
Messages: 59
Registered: March 2006
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Hi all,
I have a grey scale image and I'm able to overlay the boundary of my region but it is in black.
To improve its visualization I would like to color it(for example in blue)
Is there a way to do it?
since I have the array where the boundary indexes are stored, is there a way to associate to the the RGB triplet of a color?
thanks in advance
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| Re: Overlay a coloured boundary on a gray scale image [message #81722 is a reply to message #81659] |
Sun, 14 October 2012 23:38  |
titan
Messages: 59
Registered: March 2006
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Member |
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On Friday, October 12, 2012 2:35:41 PM UTC+2, David Fanning wrote:
> titan writes:
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>> probably my question is not clear :( and I'm sorry for this.
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>> I try to explain it better:
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>> I'm able to read a shapefile from which I'm able to obtain the corresponding image which is a binary one. Then I can extract those subscripts values where the boundary is
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>> boundary_index = WHERE(boundary_array NE 0)
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>> my gray scale image has the same dimension of the boundary image and as a consequence I can draw the line over it (in white)
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>> image[boundary_index]=255
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>> What I would like to do i to understand if I could draw this line not in white but in another color, for example yellow.
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>> Is there this possibility?
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> I presume you are using indexed color to display your image.
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> Simply load your image colors into indices 0 to 254 and
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> use color index 255 to load whatever color you like.
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> I would do it like this:
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> LoadCT, 0, NColors=254
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> TVLCT, 255, 255, 0, 255 ; Yellow in index 255
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> scaledImage = BytScl(image, TOP=254
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> scaledImage[bounary_index] = 255
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> cgImage, scaledImage
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> Cheers,
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> David
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> --
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> David Fanning, Ph.D.
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> Fanning Software Consulting, Inc.
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> Coyote's Guide to IDL Programming: http://www.dfanning.com/
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> Sepore ma de ni thue. ("Perhaps thos speakest truth.")
Hi David,
thanks a lot for your suggestion!! It works perfectly!! :)
Have a nice day
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