[AstroPy] Getting Started with Python and FITS
Wed Apr 1 08:29:55 CDT 2009
On Apr 1, 2009, at 2:28 PM, Wayne Watson wrote:
> Ultimately, I must display it in Python. If numdisplay is it, then
> that'll likely do. I would have thought pyfits would have a display
> At some point, I will want to convert a raw image, 640x480, of some
> bit depth (8, 16, 24) to a fits format. I might need to convert jpb
> images to fits too. Comments?
Keep in mind that FITS images are (almost always, if not always)
grayscale: each pixel has a single
value, though the possible values can be integers (usually 16-bit or
32-bit) or floating-point.
This is different from, e.g., a standard 24-bit color image, where
each pixel has three values (one for red,
one for green, and one for blue), and each value is an 8-bit integer.
If your "raw images" are *color* ("24 bits" sounds like a color image,
and JPEG images are usually
24-bit color images), then you'll have to figure out some way of
separating them into their individual
red, green, and blue components. Each separate component could then
be saved as a separate FITS
file (or, getting more complicated, a single FITS file with three data
Apologies if you knew this already, but it wasn't clear from your post.
Peter Erwin Max-Planck-Insitute for Extraterrestrial
firstname.lastname@example.org Physics, Giessenbachstrasse
tel. +49 (0)89 30000 3695 85748 Garching, Germany
fax +49 (0)89 30000 3495 http://www.mpe.mpg.de/~erwin
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