What is NIH Image?
NIH Image is an image processing program developed by Wayne Rasband at the National Institutes of Health. It was developed to look at medical images, but we’ll use it to look at images of Mars taken by the Viking Orbiter spacecrafts. How do I run NIH Image? There are Macintosh and PC versions of NIH Image on this CD in the Software directory. Start the mac version by double-clicking the NIH Image alias. The PC version is in the PCSoft/IMAGEPC8 directory. You can run NIH Image at the same time as you’re reading this! That’s what we recommend – it’s the best way to try out things. (It helps to have more than 8 MB of memory, and you’ll probably need 16 MB to open the bigger images of Mars.) The Basic Tools Here’s a typical screen shot of NIH Image in action. There are five windows shown here. • The color look-up table (LUT) shows what colors are or shades of gray are used in your image. • The TOOLS window lets you pick different tools, like a magnifying glass to zoom in on a feature. • Th
