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Re: Extracting image profile? [message #1190 is a reply to message #1179]

Fri, 02 July 1993 07:37

rivers
Messages: 228
Registered: March 1991

Senior Member

In article <1993Jul1.151614.13789@ousrvr.oulu.fi> martin@phoenix.oulu.fi (Martin Black) writes:
> Being a fairly novice IDL user, I haven't been able to figure out how
> to extract an arbitrary profile of data values (as opposed to pixel values)
> from an image. The routine PROFILE returns pixel values (i.e., numbers in
> the range 0-255), but what I want is the actual values of the underlying
> data. Can anyone help me out?
>
> Thanks,
> Martin Black
> martin@hiisi.oulu.fi

In general once you display an image on the screen you have lost the
information about the underlying data, and so you can only retrieve the
screen data values.

I have written a routine called IMG_SCL which is like TVSCL but does the
following:

- By default it zooms and centers the image to maximally fill the
window.

- One can specify the minimum and maximum values (i.e. black and white
values)

- One can explictly set zoom values in X and Y and centering
information.

- It copies the input ("raw data") to a common block where my own
version of a routine like PROFILE can get at it. Then when I extract
profiles I can get back the original "RAW" data values, not just the
screen pixel values.

- It allows zooming by pixel replication or by interpolation.

If interested I can mail you the required routines.

--
Mark Rivers (516) 282-7708 or 5626
Building 815 rivers@bnlx26.nsls.bnl.gov (Internet)
Brookhaven National Laboratory rivers@bnl (Bitnet)
Upton, NY 11973 BNLX26::RIVERS (Physnet)

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[Message index]

		Re: Extracting image profile? By: martin on Tue, 06 July 1993 02:56
		Re: Extracting image profile? By: rivers on Fri, 02 July 1993 07:37
		Re: Extracting image profile? By: dieh2133 on Fri, 02 July 1993 06:24
		Re: Extracting image profile? By: dieh2133 on Fri, 02 July 1993 06:20
		Re: Extracting image profile? By: add on Fri, 02 July 1993 05:48

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