<s>
Impressive	B-Application
is	O
a	O
free	B-License
and	I-License
open-source	I-License
software	I-License
that	O
displays	O
presentation	O
slides	O
with	O
3D-effects	O
.	O
</s>
<s>
It	O
is	O
a	O
lightweight	O
and	O
easy	O
to	O
use	O
console	B-Device
presentation	B-Application
software	I-Application
with	O
focus	O
on	O
PDF	B-Application
documents	I-Application
and	O
images	O
.	O
</s>
<s>
Impressive	B-Application
is	O
a	O
simple	O
presentation	B-Application
program	I-Application
that	O
displays	O
slide	O
show	O
PDF	B-Application
documents	I-Application
,	O
LaTeX	B-Application
slides	O
or	O
digital	B-Algorithm
images	I-Algorithm
in	O
the	O
JPEG	O
,	O
PNG	O
,	O
TIFF	O
and	O
BMP	B-Device
file	I-Device
formats	I-Device
,	O
adding	O
3D	O
effects	O
.	O
</s>
<s>
Presentation	O
slides	O
can	O
be	O
created	O
in	O
an	O
external	O
software	O
application	O
of	O
choice	O
and	O
Impressive	B-Application
used	O
for	O
displaying	O
them	O
.	O
</s>
<s>
Impressive	B-Application
features	O
a	O
timer	O
,	O
multi-monitor	O
setups	O
and	O
fully	O
customizable	O
keyboard	O
and	O
mouse	O
controls	O
,	O
with	O
an	O
optimal	O
keyboard	O
,	O
computer	O
mouse	O
and	O
digital	B-Device
pen	I-Device
input	O
handling	O
.	O
</s>
<s>
Impressive	B-Application
can	O
be	O
used	O
to	O
present	O
JPG	O
based	O
photographic	O
albums	O
and	O
in	O
generall	O
full	O
sets	O
of	O
documentation	O
in	O
open	O
source	O
or	O
copy-left	O
formats	O
with	O
older	O
or	O
low	O
power	O
computer	O
hardware	O
and	O
from	O
the	O
console	B-Device
.	O
</s>
<s>
Basic	O
features	O
of	O
the	O
software	O
are	O
smooth	O
alpha-blended	B-Algorithm
slide	O
transitions	O
and	O
an	O
overview	O
function	O
.	O
</s>
<s>
Impressive	B-Application
is	O
written	O
in	O
the	O
Python	B-Language
programming	I-Language
language	I-Language
,	O
and	O
PyGame	B-Operating_System
is	O
used	O
as	O
the	O
windowing	B-Application
API	B-Application
.	O
</s>
<s>
Its	O
intended	O
user	B-Application
interface	I-Application
is	O
the	O
command-line	B-Application
.	O
</s>
<s>
The	O
computer	O
graphics	O
rendering	O
of	O
PDF	B-Application
document	O
slides	O
is	O
delivered	O
by	O
Xpdf	B-Protocol
,	O
MuPDF	B-Language
or	O
Ghostscript	B-Language
.	O
</s>
<s>
OpenGL	B-Application
is	O
used	O
by	O
Impressive	B-Application
for	O
hardware	B-General_Concept
acceleration	I-General_Concept
as	O
a	O
prerequisite	O
for	O
the	O
graphical	O
effects	O
and	O
various	O
'	O
eye	O
candy	O
 '	O
.	O
</s>
<s>
While	O
hardware	O
with	O
graphics	B-Architecture
processing	I-Architecture
units	I-Architecture
(	O
GPU	B-Architecture
)	O
supporting	O
OpenGL	B-Application
2.0	O
or	O
OpenGL	B-Application
ES	O
2.0	O
are	O
required	O
,	O
Impressive	B-Application
even	O
runs	O
on	O
the	O
Raspberry	B-Operating_System
Pi	I-Operating_System
.	O
</s>
<s>
Impressive	B-Application
is	O
open-source	B-Application
under	O
the	O
GNU	O
General	O
Public	O
License	O
version	O
2.0	O
(	O
GPLv2	O
)	O
.	O
</s>
