getting input, then outputting it

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funimageput

funimageput(3)							SAORD Documentation						    funimageput(3)

NAME

       FunImagePut - put an image to a Funtools file

SYNOPSIS

	 #include <funtools.h>

	 int FunImagePut(Fun fun, void *buf, int dim1, int dim2, int bitpix,
			 char *plist)

DESCRIPTION

       The FunImagePut() routine outputs an image array to a FITS file. The image is written either as a primary header/data unit or as an image
       extension, depending on whether other data have already been written to the file.  That is, if the current file position is at the begin-
       ning of the file, a primary HDU is written. Otherwise, an image extension is written.

       The first argument is the Funtools handle returned by FunOpen().  The second buf argument is a pointer to a data buffer to write.  The
       dim1and dim2 arguments that follow specify the dimensions of the image, where dim1 corresponds to naxis1 and dim2 corresponds to naxis2.
       The bitpix argument specifies the data type of the image and can have the following FITS-standard values:

       o   8 unsigned char

       o   16 short

       o   32 int

       o   -32 float

       o   -64 double

       When FunTableRowPut() is first called for a given image, Funtools checks to see if the primary header has already been written (by having
       previously written an image or a binary table.) If not, this image is written to the primary HDU.  Otherwise, it is written to an image
       extension.

       Thus, a simple program to generate a FITS image might look like this:

	 int i;
	 int dim1=512, dim2=512;
	 double *dbuf;
	 Fun fun;
	 dbuf = malloc(dim1*dim2*sizeof(double));
	 /* open the output FITS image, preparing to copy input params */
	 if( !(fun = FunOpen(argv[1], "w", NULL)) )
	   gerror(stderr, "could not FunOpen output file: %s
", argv[1]);
	 for(i=0; i<(dim1*dim2); i++){
	   ... fill dbuf ...
	 }
	 /* put the image (header will be generated automatically */
	 if( !FunImagePut(fun, buf, dim1, dim2, -64, NULL) )
	   gerror(stderr, "could not FunImagePut: %s
", argv[1]);
	 FunClose(fun);
	 free(dbuf);

       In addition, if a Funtools reference handle was specified when this table was opened, the parameters from this Funtools reference handle
       are merged into the new image header.  Furthermore, if a reference image was specified during FunOpen(), the values of dim1, dim2, and bit-
       pix in the calling sequence can all be set to 0.  In this case, default values are taken from the reference image section.  This is useful
       if you are reading an image section in its native data format, processing it, and then writing that section to a new FITS file.	See the
       imblank example code.

       The data are assumed to be in the native machine format and will automatically be swapped to FITS big-endian format if necessary.  This
       behavior can be over-ridden with the convert=[true|false] keyword in the plist param list string.

       When you are finished writing the image, you should call FunFlush() to write out the FITS image padding. However, this is not necessary if
       you subsequently call FunClose() without doing any other I/O to the FITS file.

SEE ALSO

       See funtools(7) for a list of Funtools help pages

version 1.4.2							  January 2, 2008						    funimageput(3)

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