A Discussion of Image Formats in ArcView (Cont.):
The world file for a JPEG, BMP, TIFF, and RLC file has the same file name as the image and a "w" appended to the extension. If your operating system does not support long file names, the first and third characters of the original extension are used and a "w" is appended.
For example, image1.tiff would have a world file named image1.tiffw, or for the 8.3 file naming convention, image2.tif would have a world file named image2.tfw. Note: The world files must be in ASCII text format and stored in the same directory or folder as the image file. A typical world file for these types of images may look like:
20.154 <the dimension of a pixel in map units in the x direction>
0.000 <rotation term for row>
0.000 <rotation term for column>
-20.154 <the dimension of a pixel in map units in the y direction>
424178 <the x coordinate of the center of pixel 1,1 (upper-left pixel)>
4313415 <the y coordinate of the center of pixel 1,1 (upper-left pixel)>
