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Re: Trying to read very big image in IDL [message #68921]

Tue, 08 December 2009 16:30

Chris[6]
Messages: 84
Registered: July 2008

Member

On Dec 8, 11:02 am, Alexander Sousa <antina...@gmail.com> wrote:
> Hello everyone, i've found much of the information found here quite
> useful, which is why i require of your help for the following (sorry
> if my english is somewhat poor):
> -I'm trying to read an awfully large image (14402 cols, 9602 rows, 2
> bands, floating-point data), stored in tiff format, the problem is:
> when i try to read it using the READ_TIFF IDL throws an error saying
> it can't allocate memory to make such array... I can easily export the
> image to different data types, so feel free to advice a format
> migration; i'd be very grateful if you provided me with an efficient
> way to achieve this task.
>
> Thank you, Alexander

The SUB_RECT keyword in READ_TIFF will allow you to extract a subimage
within your large file. There's a chance that the image is too big to
fit in ram (by my calculation, it's around 1 GB). If this is the case,
then your only choice is to process the image in chunks using sub_rect

chris

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		Re: Trying to read very big image in IDL By: Chris[6] on Tue, 08 December 2009 16:30
		Re: Trying to read very big image in IDL By: Alexander Sousa on Fri, 11 December 2009 07:45

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