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I was looking through the filter.c file in the pset4-filter-less and I want to understand the theory behind the declaration of array as shown below:

RGBTRIPLE(*image)[width] = calloc(height, width * sizeof(RGBTRIPLE));

I think calloc is allocating height no. of boxes of size width each. I want to understand the part on the left hand side.

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It is a array of pointers to RGBTRIPLEs.The name is image will have total width number of pointers.Calloc is allocating height no. of boxes, each of size width times size of a RGBTRIPLE and it also initialises values to zero.

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