What do you do when you need to show an image on a display with fewer colors than are in the image itself? Solving that problem is the realm of dithering algorithms, which strategically use a limited color palette to create the illusion of more colors. In this chapter, we’ll write a program that can take any modern photo and display it on a classic monochrome Macintosh. It will convert the photo to a dithered 1-bit black-and-white version of itself and export it to a format that an early Macintosh can read: MacPaint. Along the way, we’ll learn a dithering algorithm, a compression algorithm, and a bit about file ...
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