This guide is to save other sorry plebs from needing to RTFM in figuring out how to use wget to scrape images from 4chan and other imageboards. There are lots of image downloaders in existence, but they are usually outdated and broken. You will save time following this guide to learn how to use a powerful and general purpose tool instead.
Wget is a command-line file downloader that can handle just about any file downloading task normal and power users will ever need to do. It has versions available for Windows, Mac, and Linux. If it is not already installed on your machine, install it now.