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Re: how to retain header info even after writefits [message #70923]

Fri, 21 May 2010 18:37

wlandsman
Messages: 743
Registered: June 2000

Senior Member

On May 21, 3:35 pm, sid <gunvicsi...@gmail.com> wrote:
> Hi,
> I am having fits data, im reading it in this way.
> img=readfits('file.fit',h)
> Now if I do print,h it prints the header
> a=avg(img(0:1023,0:1023),1) ; im averaging over 1024 rows
> writefits,'file1.fit',a,h ; im writing into fits file
> Now if I do print,h it prints the header were the COMMENT(the header
> consists of 8 arrays out of which one array contains comment info)
> part of the header of the original(file.fit) is different from the
> one(file1.fit) which I got now.

How are they different?

You have changed the size and dimension of your array (by averaging
over the first dimension) so writefits.pro automatically changes the
NAXIS and NAXISi keywords, which must match the size and dimensions of
the stored array. Otherwise, the FITS header should not be changed
by your script. --Wayne

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[Message index]

		Re: how to retain header info even after writefits By: wlandsman on Fri, 21 May 2010 18:37
		Re: how to retain header info even after writefits By: Craig Markwardt on Fri, 21 May 2010 14:25
		Re: how to retain header info even after writefits By: sid on Sat, 22 May 2010 11:28

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