<s>
Windows	B-Device
Image	I-Device
Acquisition	I-Device
(	O
WIA	O
;	O
sometimes	O
also	O
called	O
Windows	O
Imaging	O
Architecture	O
)	O
is	O
a	O
proprietary	O
Microsoft	O
driver	O
model	O
and	O
application	B-Application
programming	I-Application
interface	I-Application
(	O
API	B-Application
)	O
for	O
Microsoft	B-Device
Windows	I-Device
Me	I-Device
and	O
later	O
Windows	O
operating	B-General_Concept
systems	I-General_Concept
that	O
enables	O
graphics	O
software	O
to	O
communicate	O
with	O
imaging	O
hardware	O
such	O
as	O
scanners	O
,	O
digital	B-Device
cameras	I-Device
,	O
and	O
digital	O
video	O
equipment	O
.	O
</s>
<s>
It	O
was	O
first	O
introduced	O
in	O
2000	O
as	O
part	O
of	O
Windows	B-Device
Me	I-Device
,	O
and	O
continues	O
to	O
be	O
the	O
standard	O
imaging	O
device	O
and	O
API	B-Application
model	O
through	O
successive	O
Windows	O
versions	O
.	O
</s>
<s>
It	O
is	O
implemented	O
as	O
an	O
on-demand	O
service	O
in	O
Windows	B-Application
XP	I-Application
and	O
later	O
Windows	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
WIA	O
is	O
a	O
very	O
significant	O
superset	O
of	O
the	O
support	O
for	O
digital	O
still	O
imaging	O
drivers	O
that	O
was	O
provided	O
by	O
the	O
Still	B-Device
Image	I-Device
Architecture	I-Device
(	O
STI	O
)	O
in	O
Windows	B-Device
98	I-Device
.	O
</s>
<s>
Whereas	O
STI	O
only	O
provided	O
a	O
low-level	O
interface	O
for	O
doing	O
basic	O
transfers	O
of	O
data	O
to	O
and	O
from	O
the	O
device	O
(	O
as	O
well	O
as	O
the	O
invocation	O
of	O
an	O
image	O
scan	O
process	O
on	O
the	O
Windows	O
machine	O
through	O
the	O
external	O
device	O
)	O
,	O
WIA	O
provides	O
a	O
framework	O
through	O
which	O
a	O
device	O
can	O
present	O
its	O
unique	O
capabilities	O
to	O
the	O
operating	B-General_Concept
system	I-General_Concept
,	O
and	O
applications	O
can	O
invoke	O
those	O
features	O
.	O
</s>
<s>
According	O
to	O
Microsoft	O
,	O
WIA	O
drivers	O
are	O
made	O
up	O
of	O
a	O
user	O
interface	O
(	O
UI	O
)	O
component	O
and	O
a	O
driver	O
core	O
component	O
,	O
loaded	O
into	O
two	O
different	O
process	O
spaces	O
:	O
UI	O
in	O
the	O
application	O
space	O
and	O
the	O
driver	O
core	O
in	O
the	O
WIA	B-Device
service	I-Device
space	O
.	O
</s>
<s>
In	O
2002	O
,	O
Microsoft	O
released	O
the	O
Windows	B-Device
Image	I-Device
Acquisition	I-Device
Automation	O
Library	O
Tool	O
,	O
which	O
provides	O
access	O
to	O
WIA	O
functionality	O
through	O
programming	O
languages	O
and	O
scripting	O
environments	O
that	O
support	O
OLE	O
Automation	O
.	O
</s>
<s>
In	O
Windows	B-Application
XP	I-Application
,	O
WIA	O
runs	O
in	O
the	O
LocalSystem	O
context	O
.	O
</s>
<s>
Because	O
of	O
the	O
security	O
ramifications	O
of	O
running	O
a	O
service	O
as	O
LocalSystem	O
whereby	O
a	O
buggy	O
driver	O
or	O
malicious	O
person	O
would	O
have	O
unrestricted	O
access	O
to	O
the	O
system	O
,	O
the	O
WIA	B-Device
service	I-Device
in	O
Windows	B-Application
Server	I-Application
2003	I-Application
and	O
Windows	B-Application
Vista	I-Application
operates	O
in	O
the	O
LocalService	O
context	O
.	O
</s>
<s>
This	O
can	O
result	O
in	O
compatibility	O
issues	O
when	O
using	O
a	O
driver	O
designed	O
for	O
Windows	B-Application
XP	I-Application
.	O
</s>
<s>
In	O
Windows	B-Application
XP	I-Application
,	O
support	O
was	O
added	O
for	O
automatic	B-Device
document	I-Device
feeder	I-Device
scanners	O
,	O
scroll-feed	O
scanners	O
without	O
preview	O
capabilities	O
and	O
multi-page	O
TIFF	O
generation	O
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
introduced	O
Windows	B-Device
Image	I-Device
Acquisition	I-Device
2.0	O
.	O
</s>
<s>
Windows	B-Application
Vista	I-Application
also	O
has	O
the	O
WIA	O
Automation	O
library	O
built-in	O
.	O
</s>
<s>
Push	O
scanning	O
allows	O
initiating	O
scans	O
and	O
adjusting	O
scanning	O
parameters	O
directly	O
from	O
the	O
scanner	B-Application
control	O
panel	O
.	O
</s>
<s>
However	O
,	O
video	O
content	O
support	O
is	O
removed	O
from	O
WIA	O
for	O
Windows	B-Application
Vista	I-Application
.	O
</s>
