Draws a farbfeld or jpeg image to the Linux framebuffer
Usage: imgfb <image file>
<image file> : path to the image file to read (or write if reversed) or - for stdin (or stdout if reversed), can be farbfeld, jpeg or png
--framebuffer -f : framebuffer name, defaults to fb0
--offsetx -x --offsety -y : offset of image to draw, defaults to 0 0
--reverse -r : reads framebuffer and writes to a file (as farbfeld only) instead, offset does not work here