[fprint] Using the image_capture example

[Cristian Gutierrez]

Hi, I'm using libfprint examples from libfprint source code. I'm specific
interested in the image extraction, the example image_capture, actually is
running perfect, but I need this capture were a .png, not a .pgm as actually
is. My question is, if its possibly change something in the code that
changes the image format, I'm newbie on this terms so, any help will be
usefull
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