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Re: New IDL User Questions [message #25000 is a reply to message #24986]

Tue, 08 May 2001 20:30

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

"John Piccirillo" <jpicciri@radiancetech.com> writes:
> 2. Array Operations - Not being used to IDL type of array operations,
> is there a simpler way to do the following?
> a.
> For I = 0, 199 Do Begin
> For J = 0, 84 Do Begin
> If (ImageMask[I,J] EQ 1) Then ImageROI[I,J,*] =
> ImageS[I,J,*]
> Else ImageROI[I,J,*] = 0
> EndFor
> EndFor
> I thought of using the WHERE function as in,
> ROI = Where(ImageMask EQ 1)
> but ImageROI[ROI} = ImageS{ROI} leaves out the third dimension.

JD may have been thinking of a different question here. I believe you
want only a slight modification to your code:

ROI = Where(ImageMask EQ 1)
ImageROI[ROI,*] = ImageS[ROI,*]

This will include the third dimension.

> b. ;blow-up image X 9 For Screen Display
> For j = 0,84 Do Begin
> For i = 0,199 Do Begin
> JImage[3*i,3*j] = ImageS[i,j,[4]]
...
> EndFor
> EndFor

Liam plugged IMDISP so I will plug PLOTIMAGE on my web page. If you
really just want to expand an image then it is very straightforward to
use the REBIN function. Otherwise either Liam or my image display
program will be quite easy.

JImage = rebin(ImageS[*,*,4], 200*3, 85*3, 1)

The extra "1" is because ImageS[*,*,4] is really a 200x85x1 array.

Craig

http://cow.physics.wisc.edu/~craigm/idl/idl.html (PLOTIMAGE is under Graphics)

--
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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: New IDL User Questions By: Jaco van Gorkom on Thu, 10 May 2001 08:05
		Re: New IDL User Questions By: John Piccirillo on Wed, 09 May 2001 10:05
		Re: New IDL User Questions By: Craig Markwardt on Tue, 08 May 2001 20:30
		Re: New IDL User Questions By: Craig Markwardt on Tue, 08 May 2001 20:31
		Re: New IDL User Questions By: Liam E. Gumley on Tue, 08 May 2001 17:31
		Re: New IDL User Questions By: John-David T. Smith on Tue, 08 May 2001 13:01

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