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Re: hieghlighting pixel [message #71094 is a reply to message #71092]

Thu, 27 May 2010 05:11

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

afzal writes:

> in my work i need to highlight some points(pixels) of binary image
> with some color(eg:-red). cud anybody help me to do this
> thanking you

Scale your image into some number of values less
that 256, then use these "extra" values for your
colors.

image = dist(200)
scaledImage = BytScl(image, Top=250)

Now, load your colors appropriately. For example,
your scaled image now has 251 values (0 to 250),
so the color table is loaded like this:

LoadCT, 0, NColors=251

Next, load your drawing color. Red in this case,
at color index number 251:

TVLCT, 255, 0, 0, 251

Now, select your pixels that will be red:

indices = Where(image gt 75 and image lt 85, count)
IF count gt 0 THEN scaledImage[indices] = 251

Then, just display your image:

TVImage, scaledImage, /NoInterp, /Keep_Aspect

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: hieghlighting pixel By: Craig Markwardt on Thu, 27 May 2010 07:37
		Re: hieghlighting pixel By: Juggernaut on Thu, 27 May 2010 06:59
		Re: hieghlighting pixel By: Juggernaut on Thu, 27 May 2010 06:58
		Re: hieghlighting pixel By: David Fanning on Thu, 27 May 2010 05:11
		Re: hieghlighting pixel By: rogass on Thu, 27 May 2010 00:25
		Re: hieghlighting pixel By: rogass on Thu, 27 May 2010 00:20

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