[Kst] [Bug 120747] Kst should properly display fits images with reversed axes.

[Ted Kisner]

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http://bugs.kde.org/show_bug.cgi?id=120747         




------- Additional Comments From tskisner.public gmail com  2006-05-04 08:18 -------
On Wednesday 03 May 2006 14:38, Andrew Walker wrote:
| Right, I think the only thing we need to add for one-dimensional data is an
| additional vector giving the pixel index according to CRVAL, CRPIX, CRDELT.

After playing with the latest version of the WCS library, I think we need to 
procede carefully.  This library provides ways of specifying arbitrary 
coordinates to each pixel in a FITS image.  There is NO WAY that kst can 
support all the features, because we do not have arbitrary 3D plotting.

I think we should choose the most commonly used types of rectangular 
coordinate systems and support those.  The keywords mentioned above are 
listed as "deprecated" in the CFITSIO documentation.  They say that people 
should use WCS instead.

So to summarize, the most general way of handling these files is to use the 
WCS routines that read special keywords and return coordinates for a 
specified pixel in the image.  We can then compute the coordinates of 
the "corners" of the image to find the X and Y range of the image.

Does this make sense?

-Ted