Many choices are available for lossless image compression. Each technique offers different tradeoffs between compression ratios, execution speeds, and flexibility. Performance tradeoffs typically depend on user-specified scaling parameters, and on the type of image. This investigation focuses an five well-established methods for performing lossless image compression: "deflate" compression (used in many compression utilities), Lempel-Ziv-Welch (LZW, also used in many utilities), Graphic Interchange Format (GIF), Portable Network Graphic format (PNG), and baseline JPEG-LS. Several classes of imagery are covered, and the merits of three color-mapping techniques are examined.