As per my knowledge, converting an image to .dst or any other machine embroidery file format is not so simple. I tried by myself to do it as I use to do to convert a .jpeg file to .png file, it did not work. After a little research h came to know that it requires a manual digitizing process which not only takes technique, effort and time but experience too. If someone wants to digitize by himself, he should have to follow the given steps:
First of all, he needs an embroidery digitizing software.
http://aplusdigitizing.com/
He should have to know how the machine embroidery works along with essential skills.
Take your time to learn as well as you can.
After these basic points, you will be able to convert a picture into a .dst file format. It is far better to get work done by an expensive digitizer.
Please let me know if I am wrong somewhere. I need some clarity from my respected friends.