Martin;

I should have been more clear with my original enquiry, maybe also the
word that I used 'subset was misleading.

Applying some special processing to large images can be very time
consuming so I would like to reduce the entire image by a factor and not
just extract a sample segment which would be obtained (as I see it) with
tessalation "cut". 

If I am wrong and "cut" could be used please correct me.

David

On Sat, 2008-09-13 at 03:54 +0000, [EMAIL PROTECTED] wrote:
> >Can somebody suggest a way to subset working something like this:
> >
> >$ bigimage 
> >     5000 4000 3
> >$ sub10=: 10 subset bigimage
> >     500 400 3
> 
> You and everyone who has answered you so far, too, want to take a look
> at tessalation cuts in the Dictionary (";." conjunction).
> 
>                                                       Martin
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