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Re: Large TIFF file question [message #28832 is a reply to message #28830]

Tue, 15 January 2002 15:06

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

"Neil Talsania" <talsania@kodak.com> wrote in message
news:a228o1$4n6$1@news.kodak.com...
> Hi,
> I have what should be a simple question (I hope!). I am trying to run an
> IDL routine that was given to me. The routine has run successfully on
small
> images, but when I try to run it on my 1.5 Gig image it fails on the
memory
> allocation.
>
> Looking at the code, it does the following:
>
> a = float(read_tiff(filename).

I might guess that if you did it in two stages, you'd see something
interesting:

1.
aTemp = read_tiff(filename)

- this should use roughly 1.5 GB if it's an ordinary TIFF file with three
bytes per pixel (RGB)

2.
a = float(a)

- this would convert every byte to a 4-byte float, using roughly 6.0 GB!
(The aTemp can be deleted, of course, and your original wouldn't end up
with this 1.5 GB hanging around.)

Perhaps this is the problem, and you may need to get creative to find a
solution. (subsampling the array for further use?)

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		Re: Large TIFF file question By: David Fanning on Wed, 16 January 2002 05:24
		Re: Large TIFF file question By: Martin Downing on Wed, 16 January 2002 01:17
		Re: Large TIFF file question By: Craig Markwardt on Tue, 15 January 2002 20:39
		Re: Large TIFF file question By: Dick Jackson on Tue, 15 January 2002 15:06
		Re: Large TIFF file question By: bowman on Tue, 15 January 2002 14:13
		Re: Large TIFF file question By: Mark Rivers on Wed, 16 January 2002 06:54

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