PHOTPHOT

Name

photphot

Purpose (one Line Only)

Photometry from photographic image data.

Description

Uses marginal distributions and a pair of 1-D gaussian fits in each
axis to determine flux and position from an image that derives from
a photographic medium.
This routine does NOT do any local peak finding. It makes its based
entirely on the input location.

Calling Sequence

photphot,img,x0,y0,dw, $
xcen,ycen,xfwhm,yfwhm,xflux,yflux,xback,yback, $
xcenerr,ycenerr,xfluxerr,yfluxerr

Inputs

img 2-d image array. Assumed to have 1 star only.
x0 vector of starting source x positions
y0 vector of starting source y positions
dw scalar or vector of box size for fit.

Keyword Input Parameters

SKY - Scalar or vector, if provided is used for the sky background and no
fit on sky is performed.
DEBUG - Flag, if set will generate debug plots and printouts. This is
not designed to be used when you are providing vector input.
Implies verbose as well.
SILENT - Flag, if set will suppress all non-error output.
VERBOSE - Flag, if set will generate chatty out (but not nearly as much
as if the debug flag is set).

Outputs

xcen - fitted x position of source
ycen - fitted y position of source
xfwhm - fitted FWHM of source in x direction.
yfwhm - fitted FWHM of source in y direction.
xflux - fitted flux of source in x direction.
yflux - fitted flux of source in y direction.
xback - fitted image background in x direction.
yback - fitted image background in y direction.
xcenerr - uncertainty on fitted x position of source
ycenerr - uncertainty on fitted y position of source
xfluxerr - uncertainty on fitted flux of source in x direction.
yfluxerr - uncertainty on fitted flux of source in y direction.

Keyword Output Parameters

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

2007 Oct 15, Written by Peter L. Collins, Lowell Observatory
Based on Fortran code kindly supplied by Larry Wasserman.
2007/10/16, add SKY keyword and input vectors of source positions.
2007/10/21, MWB, converted to use IDL builtin, gaussfit
2007/10/29, MWB, integrated into library
2013/12/23, MWB, fixed numerous issues with input variables getting changed,
the most common problem was promoting scalars to 1-element
vectors.