grayscale

This function converts from RGB to grayscale by first converting to HSL and keeping only the L channel

Fast image processing for images in up to 4 dimensions (two spatial dimensions, one time/depth dimension, one colour dimension). Provides most traditional image processing tools (filtering, morphology, transformations, etc.) as well as various functions for easily analysing image data using R. 

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grayscale: Convert an RGB image to grayscale

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