Welcome to Fauxtoshop!
Enter name of image file to open (or blank to quit): pusheen.png
Opening image file, may take a minute...
Which image filter would you like to apply?
	1 - Scatter
	2 - Edge detection
	3 - "Green screen" with another image
	4 - Compare image with another image
Your choice: 2
Enter threshold for edge detection: 30
Enter filename to save image (or blank to skip saving): pusheen-edge-30.png

Enter name of image file to open (or blank to quit): pusheen-edge-30.png
Opening image file, may take a minute...
Which image filter would you like to apply?
	1 - Scatter
	2 - Edge detection
	3 - "Green screen" with another image
	4 - Compare image with another image
Your choice: 4
Now choose another image file to compare to.
Enter name of image file to open: expected-output-pusheen-edge-30.png
Opening image file, may take a minute...
These images are the same!

Enter name of image file to open (or blank to quit): 
Exiting.