Normalising

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oojeyboojey
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Normalising

I have a stack of sample images where the intensity of the illumination fluctuates between images.  I took another set of images simultaneously of just the illumination, which I intended to use to normalise the sample images.  Now what I want to do is find a way of normalising the entire sample image stack against the average intensity of the corresponding illumination image stack, thus eradicating the intensity fluctuations.  Is there any way of doing that automatically?