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Re: Importing Binary Images [message #28970 is a reply to message #28873]

Fri, 18 January 2002 08:51

Med Bennett
Messages: 109
Registered: April 1997

Senior Member

rob schick wrote:

> I'm new to idl, and am trying to import a binary grid that was created
> on a windows machine into idl on a linux machine. It's least
> significant byte first, 1561 rows, 2041 cols.
>
> I searched the archives and found a thread that suggested used the
> following syntax:
>
> IDL> openr, 1, 'gom15dd.dat'
> IDL> ms = bytarr(1561, 2041)
> IDL> readu, 1, ms
> IDL> tv, ms
>
> While this 'works', the image displayed is incorrect - sort of looks
> like speckled white noise. Any thoughts on what I may be doing wrong.
> For a newbie, what's the difference between using readu, and
> read_binary? The online help didn't help. Thanks.

What is the image 'supposed' to look like? It could depend on whether or
not the software that created the image created it in row-major or
column-major order. Try this:

IDL> openr, 1, 'gom15dd.dat'
IDL> ms = bytarr( 2041,1561)
IDL> readu, 1, ms
IDL> ms = transpose(ms)
IDL> tv, ms

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[Message index]

		Importing Binary Images By: rschick on Fri, 18 January 2002 06:38
		Re: Importing Binary Images By: Craig Markwardt on Fri, 18 January 2002 10:53
		Re: Importing Binary Images By: Martin Downing on Fri, 18 January 2002 09:05
		Re: Importing Binary Images By: Med Bennett on Fri, 18 January 2002 08:51
		Re: Importing Binary Images By: Nigel Wade on Thu, 24 January 2002 09:03
		Re: Importing Binary Images By: Craig Markwardt on Thu, 24 January 2002 09:06
		Re: Importing Binary Images By: Martin Downing on Tue, 29 January 2002 10:09
		Re: Importing Binary Images By: rschick on Thu, 24 January 2002 07:56

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