GRAPHICAL DATA EXCHANGE FORMATS Graphics Interchange Format GIF

GRAPHICAL DATA EXCHANGE FORMATS

Graphics Interchange Format (. GIF)

Graphics Interchange Format (. GIF) 768 Byte Indexed Color Table Contains RGB Values for 256 Colors or Gray Tones

Graphics Interchange Format (. GIF)

Choosing the Correct Pixel Density is Important for Maintaining Image Quality

Joint Photographic Experts Group (. JPG) File Format

Joint Photographic Experts Group (. JPG) File Format Data are Compressed using a “Lossy" Method where Some Data are Lost

Joint Photographic Experts Group (. JPG) File Format

Joint Photographic Experts Group (. JPG) File Format

Tagged Image File Format (. tif or. tiff)

TIFF Advantages • Flexible and adaptable file format. • Can have multiple images and data in a single file through the inclusion of "tags" in the file header. • Tags indicate the basic geometry of the image, such as its size, or if one of several image compression options are used.

TIFF World File --GEOTIFF (. tfw)

ESRI TIFF World File – 6 ASCII Lines 1. Horizontal distance in meters represented by each pixel. 2. Rotation angle about the y axis. 3. Rotation angle about the x axis. 4. Vertical distance in meters represented by each pixel. Normally negative because an image has its origin in the top left corner. 5. Easting coord. of the center of the top left pixel. 6. Northing coord. of the center of the top left pixel.

TFW File Example 0. 6 0 0 -0. 6 355000. 317 459999. 682 Sometimes will have two additional lines: 1. Grid zone or coordinate system 2. Datum