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Re: Overlaying where data [message #58338 is a reply to message #58288]

Sun, 27 January 2008 19:46

izimine
Messages: 11
Registered: November 1997

Junior Member

> Ok, let's see if I can explain this more clearly. First, I display
> the original image in tvscl. Then, I've got a second array that I've
> determined the % of a given mineral per pixel (say from 0 to 1 or 0 to
> 100 either way you want to look at it). I can tvscl the % mineralogy
> no problem in a window on its own (colored or grey scale).

if you want to do it in direct graphics with color tables...

; load background and overlay colors (change ncolors as needed)
loadct, 0, ncolors=128
loadct, ???, bottom=128, ncolors=128 ; or use tvlct
; bytscale accordingly
back = bytscl(orig, top=127)
over = bytscl(minerals, top=127)+128
; make a binary mask of what you want to show
mask = (minerals gt val1 * minerals lt val2) + (minerals gt val3)
; display
tv, back*(1-mask) + over*mask

if you need transparency better look at object graphics

cheers

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[Message index]

		Overlaying where data By: jtmcahill on Thu, 24 January 2008 12:39
		Re: Overlaying where data By: izimine on Mon, 28 January 2008 00:58
		Re: Overlaying where data By: izimine on Sun, 27 January 2008 19:46
		Re: Overlaying where data By: pgrigis on Fri, 25 January 2008 12:53
		Re: Overlaying where data By: David Fanning on Fri, 25 January 2008 12:05
		Re: Overlaying where data By: jtmcahill on Fri, 25 January 2008 11:53
		Re: Overlaying where data By: David Fanning on Fri, 25 January 2008 10:52

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