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Re: Division of two images [message #29257]

Fri, 08 February 2002 05:19

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Carsten Liess (carsten@rad.uni-kiel.de) writes:

> I am a complete newbie to IDL, and here's probably a very easy
> question for you guys;
> I am trying to divide one image by another (i.e. pixel by pixel),
> where the pixel intensity is quite similar in both pictures. I then
> want to create a thrid image as the result of the division.
> I read in the two images and define a fltarr for the division. The
> result I get is an image with either 0.00000 or 1.00000 intensity. For
> some reason it seems that the result of the division is an integer
> number. Can someone help?

Cast one of your arrays to FLOAT before you do
the division, otherwise you will be doing integer
division:

result = FLOAT(image1) / image2

Cheers,

David

--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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		Re: Division of two images By: David Fanning on Fri, 08 February 2002 05:19
		Re: Division of two images By: Mark Hadfield on Sun, 10 February 2002 13:23

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