The INPUT Command

The POWDER DIFFRACTION (2-D) Interface INPUT command is different from other INPUT commands in that it has an additional graphical form to control correction of spatial distortion and non-uniformity of intensity response on input.

The initial selection of the input file and format is the same as the other INPUT commands. See Section 5.1, Page  for further information.

When the raw data has been input a graphical form similar to the one shown in Figure 33 is displayed.

Figure 33: The Distortion Correction Control Form

The form allows the following options:

FLAT-FIELD: Controls the application of a flat-field correction to the data immediately on input. If YES is selected the input data will be divided pixel be pixel by the data input from the file defined by FF FILE.

FF FILE: This uses the file selection tool to input a file to be used for flat-field correction.

FF SCALE: If the flat-field file data has not been normalised you may want multiply the data by a scale factor. In this case, this should be set to YES. The multiplier is set with FF MULTIPLIER.

FF MULTIPLIER: The scale factor to multiply the result of any flat-fielded data.

SPATIAL DIS.: Control correction for spatial distortion or not. If YES then the file defined by SD FILE is used to define the distortion function.

SD FILE: This uses the file selection tool to input a file to be used for the spatial distortion correction.

As any spatial distortion correction is applied, a progress report is output in the terminal window.