Hello,
I have a lot of geotiffs that I want to import into a map project. Unfortunately these blueprints are framed by a white background, which I would like to transform into a transparent one. Basically I only want to keep the lines, that make up these blueprints.
I imagine the required steps somewhat like this:
- Select the background. Since every blueprint has a different shape, i would try try to detect the background-pixels by colour (white). Possible drawback: Single pixels in the needed Picture could also be white and therefore be falsely selected. Is there a transformer for this you would recommend?How else could I differentiate the needed parts of the geotiff?
- Delete the selected pixels or turn them transparent.
- Another issue that I worry about: The thin, dark lines of the blueprints might hardly be visible on an orthophoto-based map. Can I somehow change the colour of my outcome?
Since I am new to FME, I wonder which transformers I should use. If you are experienced with similar projects, please let me know how you solved this.
Thanks!