NAME¶

spydr - GUI for Image display and analysis with yorick

SYNOPSIS¶

Spydr (pronounce spider) can be invoqued from the shell

spydr [ options ] image1.fits [ image2.fits ... ]

 

where the fits images can contain single images (not necessarily of the same size) or data cube. Widlcards are allowed in names.

or within yorick

#include spydr.i

 

spydr,im1,im2,cube

 

spydr,"image1.fits",...

COMMAND LINE OPTIONS¶

--conf file

configuration file.

--hdu value

Specify a fits HDU to read

--dpi value

Yorick dpi value (yorick default = 75, spydr default = 83). Any value between 30 and 150 make sense.

--itt value

Intensity Transfer Table (1=linear, 2=sqrt, 3=square, 4=log, 5=hist equalized)

--pixsize value

Pixel size (or plate scale) in arcsec.

--boxsize value

Size of box for PSF fitting and Strehl calculation (pixels)

--saturation value

Value above which pixels have to be considered as saturated (ADU)

--wavelength value

Force wavelength for all images

--zeropoint value

Photometric zeropoint (magnitude)

--nbins value

Number of bins for histograms

--strehlaper value

Diameter of circular mask for Strehl calculations (pixels). The flux is integrated in a circle of this diameter, while the sky is estimated from the remaining pixels within the box of size "boxsize"

--batch

Turn on yorick batch mode (yorick quits when encountering an error). This flag is recommended when starting spydr from a non-interactive session (e.g. from a gnome applet).

--debug

Turn on the verbose mode (debugging mode).

--invert

Invert LUT

--fullgui

Show the plugin pane when the GUI is realized

--compact

Hide the lower part of the GUI at startup

DESCRIPTION¶

Spydr is a GUI for image visualization and simple analysis (cuts, zoom, values, statistics, histogram, sigma filter) with changeable LUT and ITT. Spydr has a couple of plugins to measure FWHM and Strehl. Press "?" on the main display area to get a popup help: The following shortcuts are available:
x/y: Plot line/column under cursor
X/Y: Toggle continuous plot of line/column
under cursor
c: Interactive plot of cut across image
h: Plot histogram of visible region
r: Radial plot centered on cursor
f: Fit 1d gaussian to 1d plot
e: Adjust min and max cut to 10% and 99.9%
of distribution
E: Reset min and max cut to min and max
of visible region
n/p: Next/prevous image
s: Sigma filter displayed image
-/+: Decrease/Increase zoom factor in zoom window
?: This help

EXAMPLES¶

From the shell:
$ spydr --dpi 74 --fullgui 20070730_2*.fits
$ spydr --pixsize 0.127 20070730_2[2-3]?.fits 20070730_241.fits
Within yorick:
> spydr,"~/ascam/2007jun26/20070625T2000*.fits"
> spydr,["20070730_1[1-3].fits","20070730_23.fits"]
> spydr,image
> spydr,[im1,im2]
> spydr,im1,im2

ENVIRONMENT VARIABLES¶

Y_PYTHON

Force the path to spydr.py. The default path is

 

./:Y_USER:Y_USER/python/:Y_SITES/python/:Y_SITE/python/

Y_GLADE

Force the path to spydr.glade. The default path is

 

./:Y_USER:Y_USER/glade/:Y_SITES/glade/:Y_SITE/glade/

Y_CONF

Force the path to spydr.conf. The default path is

 

./:Y_USER:Y_SITE:/etc/:

 

./share/:Y_USER/share/:Y_SITE/share/:

 

./share/spydr/:Y_USER/share/spydr/:Y_SITE/share/spydr/

 

 

RESTRICTIONS AND BUGS¶

- only fits images handled to date
- the ITT display is not very well handled

AUTHOR¶

Francois Rigaut, Gemini Observatory

FILES¶

Input files:

spydr.conf

The spydr configuration file. Needed. It should have come with your installation. The routine which_spydrconf() returns the path to the used spydr.conf. The following directories are searched for spydr.conf, in this order: Y_USER, Y_SITE, /etc, Y_USER/share, Y_SITE/share, Y_USER/share/spydr, Y_SITE/share/spydr. If you wish to modify the defaults, copy the file over to Y_USER and modify at will.

Output files: none.

SEE ALSO¶

yorick(1), yao(1)