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144 WinView/32 Manual Version 2.4.M
Each pixel in a new file will be divided by the corresponding pixel in the Flatfield file. If
both Flatfield and Background are selected, the background will be subtracted first,
before the flatfield correction.
CCD Blemishes
The columns specified as bad in the blemish removal file will be replaced by
interpolated data as the data is collected. The selected blemish pattern file appears in the
textbox. Clicking on the button at the right of the box opens a browse dialog box to
facilitate file selection. Note that blemish removal requires that a proper blemish pattern
file be available. The blemish removal pattern is defined by the user and can be specified
for any device. Note: CCD Blemishes removal is not implemented in early releases of the
software.
Cosmic Ray Removal
Causes highly localized spikes, such as would be caused by cosmic rays interacting with
the silicon of the CCD, to be removed from the data after it is acquired but before it is
stored. Two different techniques (in addition to OFF) can be selected. The spatial
technique compares the data with the set threshold level. The temporal technique
compares a series of spectra and requires no user parameters. Radio buttons allow you to
select Off, Temporal, and Spatial. If Spatial is selected, the Threshold setting determines
how large a data spike must be to be identified as a cosmic ray effect. A setting of 50
will give good results in most situations. Cosmic ray data is replaced by interpolated
before-and-after data.