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Chapter 10 Post-Acquisition Processing Mask Operations 167
Look Up Table
Input tab page
The Input tab page selects the data to be operated on. The user can specify the data file,
the frames within the file, and the X and Y range on the CCD. The input data type is
reported. Note that the
Mouse
button at the bottom of the window allows you to use the
mouse to specify the region to be processed. Simply drag a box in the data region of the
active window and then click on
Mouse
. The
Frame
and
Range
parameters will
assume the values of the defined region. The
Mouse
button is only active when the
Input
tab page is selected.
Look-Up Table tab page
This page allows the selected input data values to be mapped to different output values
using a look-up table (LUT). The data format must be unsigned integer (0 to 65,000) and
there can be as many as 65,000 value pairs (Input and Output) in the table. Values below
zero are converted to zero. Values above 65 k are converted to 65 k. Minimum and
maximum values can be specified. LUTs are ordinary text files. The text entry box and
associated browser button facilitate accessing the LUT. However, before a LUT can be
used to process data, it must be converted to binary, accomplished by clicking on the
Create Binary LUT
button.
Output tab page
The Output tab page allows you to save the processed data to disk. It additionally allows
you to select whether the modified data is to be displayed and to select the data type. The
frame and X-Y range are reported information only.
Look-Up Table Procedure
Use the following procedure to process data using the LUT.
Figure 149.
Look-Up Table.