[Qgis-user] Editing the world file

[LeventB]

Hi there!
As i am writing a tutorial for open-source GIS, i want to make students
familiar with the world file connected to a *.tif. The goal is to
georeference a raster map by editing the *.tfw, which works well in ArcGIS.
There, i proceed in the following way:

1. Open the *.tfw with an editor
2. Adjust the coordinates
3. Save the *.tfw
4. Delete the *.aux file
5. Load the map to the canvas

Strangely, this procedure doesn't have any effect in QGIS. Even if i delete
every related file except from the *.tfw and the *.tif itself, the map will
display the same as before. I wonder where QGIS gets the coordinates?

Does anyone have an idea?

Thanks and have a nice week,
Levent
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