An easy way to determine if an image is georeferenced is to follow these steps:
- Open the image in the TatukGIS Viewer.
- Move the mouse cursor to find the pixel at or near the upper-left corner of the image.
- Check the displayed X/Y coordinate values. If the coordinate values are 0,0 (or close to 0,0), the image file is probably not georeferenced.
JPEG, PNG, and BMP image files require a World File (or a TAB registration file) to be georeferenced. (The associated World or TAB file contains the georeference information for the image.) Other image formats, such as GeoTIFF, can have the georeference information embedded in the image file.
World File is explained in knowledge base item KB10423 and at Wikipedia: https://wikipedia.org/wiki/World_file