Contiguous is an option with the magic wand tool in Photoshop.
And just for you, JB:
(by the way, I wrote the international phonetic letter wrong. It should have been /?/ )
Articulation of /?/
1. The sound /?/ is a nasal vowel. A nasal vowel is produced by lowering the back of the velum (velic valve) so that the air stream is exhaled partly through the nasal passage and partly through the oral passage. The vowel /?/ is quite similar to the oral vowel /?/ except for its nasality: trait-train, mais-main, laid-lin, paix-pain. In order to articulate /?/, spread your lips horizontally as for /?/, but let your breath escape simultaneously through your nose and mouth: /?/------>nasalizing------>/?/. You should be able to say /?/ continuously as long as your breath lasts. Change in the nasality of the vowel indicates that the velic valve is not held in a tense and steady position.
It's really too bad I can't duplicate the illustrations here. For best effect, articulate these sounds while sitting in a laboratory classroom, wearing headphones, surrounded by 15 other students and not knowing when exactly the teacher is going to listen in on your practice and then interrupt you with "Bien. Continuez."