Re: My problem or yours?/test

[Tom Droege <tdroege@veriomail.com>]

Chris and all,

DS-0 gives me a 2064 x 2037 image.  That is what I expect.

There are 2 or 3 "covered" lines at the top (W) of the image, and 4 or 5 at 
the bottom (E).

The overscan pixels are where they should be.  I count 15 of them and 6 
covered at the far edge.  It is quite passible that I am one off in 
figuring out the overscann pixels as I am not sure exactly which pixel I am 
digitizing.  This depends on knowing how the pixels match the clock 
phases.  I do not understand the process well enough to know which pixel is 
actually being digitized.

Does anyone want me to change what I am presently writing in the fits header?

Tom

At 04:35 PM 10/25/01 -0700, you wrote:

>Tom,
>
>Here is one test:
>
>1) ask DS-9 how big the image is.  Does it match the number
>of image pixels on the CCD chip?  This is not the same as
>the number read out.
>
>2) Look at the edges of the image.  Does the image extend to
>all four edges or is there a "frame" showing?  You may need
>to enlarge the image 4x or more to see it.
>
>If the size is correct and there is no frame then DS-9 must
>have figured out how to find the "good" pixels, likely by
>reading the header.
>
>Andrew has told us all how we can mass-edit an entire directory
>of FITS files to corect the header line.
>
>          hedit *.fit datasec '[ 17:2041, 3:2033]'
>
>Is the image realy that size? I'd expect it to be square.
>
>
>
>--- Tom Droege <tdroege@veriomail.com> wrote:
> > I have been using DS-9 to read the images.  They come up with DS-9
> > with the
> > right orientation, and the right coordinates.  To a degree or so.  It
> > is
> > good enough that even with a pretty bland field (no really bright
> > stars) I
> > can match the fields up to the sky atlas.
> >
> > This is my test of the fits header.  If anyone has a better test, I
> > will
> > start using it.
> >
> > Tom Droege
>
>
>=====
>Chris Albertson
>   Home:   310-376-1029  chrisalbertson90278@yahoo.com
>   Cell:   310-990-7550
>   Office: 310-336-5189  Christopher.J.Albertson@aero.org
>
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