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You should have an image already opened. A small window named Multiply is opened. It enables to multiply each pixel value by a constant factor (e.g. 1.25).

SalsaJ Multiply

This function is typically useful if you want to perform an operation on an image (e.g. to correct for a flatfield). See also the other operation proposed in the menu Process/Single Image Operators.

It is not used in the actual series of EU-HOU exercises.