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Re: reading images stored compressed in FITS files binary extensions [message #70389]

Fri, 09 April 2010 06:26

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Apr 8, 3:44 pm, wlandsman <wlands...@gmail.com> wrote:
> On Apr 8, 2:33 pm, Jeremy Bailin <astroco...@gmail.com> wrote:
>
>> Does anyone know what routine in the astronomy user's library (or any
>> other routine) can read in an image that's stored compressed in the
>> binary extension of a FITS file?
>
> This looks like a "pixel list" (PLIO) compressed file, which can be
> uncompressed with FPACK software
> ( http://heasarc.gsfc.nasa.gov/fitsio/fpack/).
>
> Once you have FPACK installed, you can read the file directly with
> readfits.prohttp://idlastro.gsfc.nasa.gov/ftp/pro/fits/readf its.pro)
> or mrdfits.pro. These procedures use a SPAWN with a bidirectional
> pipe to FPACK to stream the images into IDL variables.
>
> Cheers, --Wayne

Aha, works like a charm!

Thanks,
-Jeremy.

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Re: reading images stored compressed in FITS files binary extensions [message #70396 is a reply to message #70389]

Thu, 08 April 2010 12:44

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On Apr 8, 2:33 pm, Jeremy Bailin <astroco...@gmail.com> wrote:
> Does anyone know what routine in the astronomy user's library (or any
> other routine) can read in an image that's stored compressed in the
> binary extension of a FITS file?

This looks like a "pixel list" (PLIO) compressed file, which can be
uncompressed with FPACK software
( http://heasarc.gsfc.nasa.gov/fitsio/fpack/ ).

Once you have FPACK installed, you can read the file directly with
readfits.pro http://idlastro.gsfc.nasa.gov/ftp/pro/fits/readfits.pro )
or mrdfits.pro. These procedures use a SPAWN with a bidirectional
pipe to FPACK to stream the images into IDL variables.

Cheers, --Wayne

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