[fprint] Artefacts in images from fprint-demo

[Bastien Nocera]

Hey Josh,

On Thu, 2018-08-16 at 20:14 +0100, Josh Holland wrote:
> Hi,
> 
> I was trying out my fingerprint sensor (EgisTec ES603) with fprint-
> demo, and I noticed that fairly often the image produced when
> verifying is twice as tall as normal, and the bottom half contains
> only some long vertical lines. Is this indicative of a problem with
> my particular fingerprint sensor, or with fprint (and if so, is there
> anything I can do to help debug it)? Is it likely to affect
> fingerprint recognition?
> 
> I'm using fprint from the Ubuntu Bionic repositories – apt reports
> that fprintd is at version 0.8.0-2.

Better late than never, I hope at least. This is likely a bug in the
driver itself, though there were some bug fixes related to image
manipulation in recent months.

If you feel comfortable with it, you could test with the development
version of libfprint, or wait until it gets updated.

Cheers