Posted by
Adrian Martin on
Jun 01, 2009; 4:45pm
URL: http://imagej.273.s1.nabble.com/cannot-open-FITS-image-with-extended-header-tp3692336p3692337.html
ImageJ does not handle extensions, as far as I can know. Your file
has an "image" extension where the data is held, so that's why it
gets confused (it also has -32bits which might be confusing too). I
use table extensions regularly, and am working on a plugin to deal
with those, but the FITS standards cover many cases and writing
something to suit everyone's FITs files would take a lot of work.
I'd be interested to hear from anyone who has written an even half-
working version of code to do this!
Dr Adrian Martin
Sensor Sciences, 3333 Vincent Road, Suite 103, Pleasant Hill, CA 94523
(925) 296 0848 phone, (925) 296 0849 fax
On Jun 1, 2009, at 12:02 AM, Sergei Goshko wrote:
> Hi,
>
> I cannot open FITS file downloaded from HLA (i.e.
http://archive.stsci.edu/cgi-bin/hla/getdata.cgi?download=1&dataset=hlsp_coma_hst_acs-wfc_v19_f814w&filename=hlsp_coma_hst_acs-wfc_v19_f814w_v1_ivm-drz-cl.fits
> )
>
> The file has extended FITS header and I believe it confuses ImageJ.
> The message I get is "This does not appear to be a FITS file."
> The image can be opened with no problem by SAO DS9 viewer. SAO shows
> both headers.
> I just downloaded latest release of ImageJ 1.41 and the problem is
> still there.
> Is there any work around?
>
> Thank you.
> Sergei
>
>
> The header of the image above looks like:
>
> SIMPLE = T / Fits standard
> BITPIX = 16 / Bits per pixel
> NAXIS = 0 / Number of axes
> EXTEND = T / File may contain extensions
> ORIGIN = 'NOAO-IRAF FITS Image Kernel July 2003' / FITS file
> originator
> IRAF-TLM= '10:58:58 (24/07/2007)' / Time of last modification
> NEXTEND = 3 / Number of standard extensions
> DATE = '2007-02-19T22:26:34' / date this file was written (yyyy-
> mm-dd)
> .............
> END
> XTENSION= 'IMAGE ' / Image extension
> BITPIX = -32 / Bits per pixel
> NAXIS = 2 / Number of axes
> NAXIS1 = 4225 / Axis length
> NAXIS2 = 4300 / Axis length
> PCOUNT = 0 / No 'random' parameters
> GCOUNT = 1 / Only one group
> ORIGIN = 'NOAO-IRAF FITS Image Kernel July 2003' / FITS file
> originator
> EXTNAME = 'SCI ' / Extension name
> EXTVER = 1 / Extension version
> DATE = '2007-02-19T22:26:35' / Date FITS file was generated
> IRAF-TLM= '11:00:08 (24/07/2007)' / Time of last modification
> INHERIT = T / inherit the primary header
> EXPNAME = 'j9ty19xyq ' / exposure identifier
> BUNIT = 'ELECTRONS' / brightness units
> ....................
> END
> <binary data>