CCDGAIN

Name

ccdgain

Purpose (one Line)

Extract and plot CCD gain transfer curve from flat field image data.

Description

Calling Sequence

ccdgain,root,start,nframes,calibfile

Inputs

root - Root of the image file name (no path, with period).
start - first frame number to process
nframes - number of frames to process
calibfile - Calibration file, defailt is CALIBPATH/files.cal

Optional Input Parameters

Keyword Parameters

CALIBPATH - Path for calibration files. Default is PATH/calib
EXCLUDE - Optional vector of image numbers that should be excluded from
average. Default is to include all frames.
EXPKEY = String - FITS keyword to read to get exposure time, default = EXPTIME
FILKEY = String - FITS keyword to read to get filter code, default = FILPOS
Note: If you have multiple filter wheels AND you have a set of keywords
in the form KEYn where n is a single digit number and KEY is a
static string pattern (eg., FILT_0, FILT_1, etc.), then give this
keyword as KEY* (ex: FILT_*). When processed, you will get a
string back from the concatenation of all the filter strings,
separated by '+'.
PATH - Path to the raw data, default = ''
SECTION - 4 element vector which, if provide, defines the region of the
array dimensions that are used to scale the mean
of the arrays before combining (. If combined in this
manner, the arrays are combined weighted by the means.
[x1,x2,y1,y2]
These coordinates apply to the pixel locations AFTER cropping.
The default is to use the center 50% of the image but not any
bigger than 200x200 subsection at the center.

Outputs

Common Blocks

Side Effects

Restrictions

Procedure

Modification History

93/04/03 - Initial conversion to procedure, Marc W. Buie, Lowell Obs.
96/01/06 - MWB, added support for hardcopy under DOS/Windows
97/03/15 - MWB, added use of MARKDATA
2004/05/05, MWB, added some documentation and changed the plot
axes to conform to standard practice. Also, changed
the action of the SECTION keyword to match the
similar action with SCALE keyword in mkflat.pro
2006/07/14, MWB, changed to use CCDPROC instead of hardcoded calibration
2006/07/25, MWB, slight mod to support multiple filter wheels