Is it possible to save a jpg of fingerprint, right now fingerprint sensors found in laptops and mobiles are used to unlock them.
You will not be able to see your fingerprint since the fingerprint that you add will be stored only in the backend. It is used to compare with the stored fingerprint when you try to unlock with fingerprint.
And moreover fingerprint will not be stored as image format. During unlocking your fingerprint image sent for extraction in the IC chip.
The extraction takes place by image processing, and extracted details are stored as templates.
So the template of your default fingerprint is compared with the fingerprint that you give during unlocking. If matched, your screen is unlocked.
Templates are not even part of the OS, so its impossible to retrieve the fingerprint image. Templates will be stored only in ICs.
So basically you can't export your fingerprint as picture. In high-end devices, fingerprint data will be encrypted and can't be exported.