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Simple Image processing

A range of useful image processing commands is available within LEXT. Namely:

• ADDI, SUBI, MULI, DIVI for the combination of two images via the pixel by pixel application of the specified binary operator. The result is stored in the next free slot.
• ADDC, MULC for the addition of, or multiplication by, a constant. The result overwrites the original.
• SMOOTH applies 2D tophat (default), gaussian ( /GAUSSIAN) or median ( /MEDIAN) smoothing to an image. The size and specification of the filter is prompted for. This routine operates on the current region unless over-ridden with the /ALL option.

These might be used for basic calibration such as debiasing and flat-fielding of the data.