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VIPSIP  July 2012

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Subject:

Re: nip2 batch processing - how to extract 3 bands from tiff

From:

Sid Samsi <[log in to unmask]>

Reply-To:

VIPS/ip <[log in to unmask]>

Date:

Wed, 11 Jul 2012 19:25:43 +0100

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text/plain

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John : Thank you again for your prompt answers. 

I ran the following and it worked flawlessly :

vips extract_band /tmp/input.tif /tmp/output.tif[bigtiff,tile,tile-width=256,tile-height=256] 0 --n=3

However, the following command hung after the file output.tif was a little over 8GB (which is the file size I was expecting). The only difference is that I was requesting a pyramidal tiff :

vips extract_band /tmp/input.tif /tmp/output.tif[pyramid,bigtiff,tile,tile-width=256,tile-height=256] 0 --n=3

Interestingly, after I killed the vips process, it turned out that the file output.tif had been generated correctly. Not sure why vips did not exit on it's own. If there is a way to generate more debug information to help identify the problem, please let me know and I'll be happy to provide it. 

The final solution I am now using is a two step procedure : 

vips extract_band /tmp/input.tif /tmp/output.tif[bigtiff,tile,tile-width=256,tile-height=256] 0 --n=3
vips tiffsave /tmp/input.tif /tmp/output.tif --pyramid --tile --tile-width=256 --tile-height=256 --bigtiff

As far as he end result is concerned, the two separate steps are fine and they produce the images in the format I need. 
Thank you very much for your help 
-Sid

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