question about imcopy.c

Hi all,
I am a brand new user of CFITSIO and still in the learning stage.
I got confused when I tried to use the imcopy.c

According to Page 46 of CFITSIO reference guide from
http://heasarc.gsfc.nasa.gov/FTP/sof...o/c/cfitsio.ps

imcopy infile.fit ’outfile.fit[compress R 100,100; q 10.0]’

should use tile compression and quantization scale of 10.
However when I try the above on the imcopy provided in

http://heasarc.gsfc.nasa.gov/docs/so...mples/imcopy.c
the above does not work.
I get the error
"FITSIO status = 125: parse error in input file URL"
It works when get rid of "q" , but this assumes noise bits = 10 rather
than the quantization scale.
This means that I am looking at either outdated reference manual or
the using the outdated
version of imcopy.c? Could someone let me know where is the latest
version of imcopy.c
and the CFITSIO reference manual?
Thanks
Shantanu

I think the problem is that you are using an old version of CFITSIO.
The 'q' syntax was added fairly recently, so get the new 3.100 version
of CFITSIO and try again. If you still have problems send me a private
email.

In addition, the old imcopy program is obsolete and has been replaced by
a new pair of FITS image compression/uncompression programs called fpack
and funpack. These utility programs are analogous to gzip and gunzip,
but are optimized for astronomical images so they are faster and produce
smaller compressed files. These utilities were developed in
collaboration with Rob Seaman (NOAO) and Rick White (STScI). They are
available at http://heasarc.gsfc.nasa.gov/docs/so.../fitsio/fpack/
and are also bundled in with the CFITSIO 3.100 distribution.

Bill Pence

wrote:
Hi all,
I am a brand new user of CFITSIO and still in the learning stage.
I got confused when I tried to use the imcopy.c

According to Page 46 of CFITSIO reference guide from
http://heasarc.gsfc.nasa.gov/FTP/sof...o/c/cfitsio.ps

imcopy infile.fit ’outfile.fit[compress R 100,100; q 10.0]’

should use tile compression and quantization scale of 10.
However when I try the above on the imcopy provided in

http://heasarc.gsfc.nasa.gov/docs/so...mples/imcopy.c
the above does not work.
I get the error
"FITSIO status = 125: parse error in input file URL"
It works when get rid of "q" , but this assumes noise bits = 10 rather
than the quantization scale.
This means that I am looking at either outdated reference manual or
the using the outdated
version of imcopy.c? Could someone let me know where is the latest
version of imcopy.c
and the CFITSIO reference manual?
Thanks
Shantanu

Thanks for the info. I have one question. When I look at the tile
compressed
image file with fv , how do I find out the value of ZSCALE and ZZERO
for each pixel?
In the original image the values of the pixels are 500.296875,
494.3046875
etc when I use fv to look at the image.
When I looked at the tiled compressed image, the vales for the same
are
-32267.6708622559 and -32273.7009830322. Obviously these have been
scaled from the original pixel values using ZSCALE and ZZERO. How do I
find out these values?
Here is what the header fir the tiled compressed image says :
TFIELDS = 4 / number of fields in each row
TTYPE1 = 'COMPRESSED_DATA' / label for field 1
TFORM1 = '1PB(10726)' / data format of field: variable length
array
TTYPE2 = 'UNCOMPRESSED_DATA' / label for field 2
TFORM2 = '1PE(0) ' / data format of field: variable length
array
TTYPE3 = 'ZSCALE ' / label for field 3
TFORM3 = '1D ' / data format of field: 8-byte DOUBLE
TTYPE4 = 'ZZERO ' / label for field 4
So presumably the values of ZSCALE and ZZERO are in the third and
fourth
field. But how do/can I get these values for each pixel?
Any information on this will be appreciated.
Thanks