This document discusses using makefiles to automate image processing tasks like scaling large sets of images. It presents a problem of needing to repeatedly scale images when target resolutions change. The proposed solution is to use NetPBM image tools and GNU make, which is well-suited for automating transformations from input to output files according to rules. An example makefile is provided that uses find, patsubst and shell commands to scale images in a source directory to a target resolution and save them in a scaled directory.