The Graphics Interchange Format is a bitmap image format that was introduced by CompuServe in 19871 and has since come into widespread usage on the World Wide Web due to its wide support and portability. The format supports up to 8 bits per pixel thus allowing a single image to reference a palette of up to 256 distinct colors. The colors are chosen from the 24-bit RGB color space. It also supports animations and allows a separate palette of 256 colors for each frame. The color limitation makes the GIF format unsuitable for reproducing color photographs and other images with continuous color, but it is well-suited for simpler images such as graphics or logos with solid areas of color.
I used six images of Mulnomah Falls to create the GIF. To give it a little smoother look, I copied those six frames and pasted them at the end of the original six frames and then reversed the order.
Here is a single image of the Falls.