<s>
Reverse	B-General_Concept
video	I-General_Concept
(	O
or	O
invert	O
video	O
or	O
inverse	B-General_Concept
video	I-General_Concept
or	O
reverse	O
screen	O
)	O
is	O
a	O
computer	O
display	O
technique	O
whereby	O
the	O
background	O
and	O
text	O
color	O
values	O
are	O
inverted	O
.	O
</s>
<s>
On	O
older	O
computers	O
,	O
displays	O
were	O
usually	O
designed	O
to	O
display	O
text	O
on	O
a	O
black	O
background	O
by	O
default	B-General_Concept
.	O
</s>
<s>
Nowadays	O
the	O
two	O
tend	O
to	O
be	O
switched	O
,	O
since	O
most	O
computers	O
today	O
default	B-General_Concept
to	O
white	O
as	O
a	O
background	O
color	O
.	O
</s>
<s>
The	O
opposite	O
of	O
reverse	B-General_Concept
video	I-General_Concept
is	O
known	O
as	O
true	O
video	O
.	O
</s>
<s>
If	O
the	O
source	O
image	O
is	O
of	O
middle	O
brightness	O
,	O
reverse	B-General_Concept
video	I-General_Concept
can	O
be	O
difficult	O
to	O
see	O
,	O
127	O
becomes	O
128	O
for	O
example	O
,	O
which	O
is	O
only	O
one	O
level	O
of	O
brightness	O
different	O
.	O
</s>
<s>
Reverse	B-General_Concept
video	I-General_Concept
is	O
commonly	O
used	O
in	O
software	O
programs	O
as	O
a	O
visual	O
aid	O
to	O
highlight	O
a	O
selection	O
that	O
has	O
been	O
made	O
as	O
an	O
aid	O
in	O
preventing	O
description	O
errors	O
,	O
where	O
an	O
intended	O
action	O
is	O
performed	O
on	O
an	O
object	O
that	O
is	O
not	O
the	O
one	O
intended	O
.	O
</s>
<s>
On	O
a	O
terminal	O
understanding	O
ANSI	O
escape	O
sequences	O
,	O
the	O
reverse	B-General_Concept
video	I-General_Concept
function	O
is	O
activated	O
using	O
the	O
escape	O
sequence	O
CSI	O
7	O
m	O
(	O
which	O
equals	O
SGR	O
7	O
)	O
.	O
</s>
<s>
Reverse	B-General_Concept
video	I-General_Concept
is	O
also	O
sometimes	O
used	O
for	O
accessibility	O
reasons	O
.	O
</s>
<s>
Flicker	B-General_Concept
was	O
also	O
an	O
issue	O
with	O
early	O
white-background	O
displays	O
.	O
</s>
<s>
For	O
the	O
same	O
,	O
white-dominant	O
reason	O
,	O
reverse	B-General_Concept
video	I-General_Concept
is	O
an	O
efficient	O
way	O
to	O
read	O
or	O
write	O
text	O
in	O
a	O
dark	O
environment	O
,	O
since	O
the	O
darkness	O
of	O
the	O
screen	O
may	O
blend	O
into	O
the	O
darkness	O
of	O
the	O
environment	O
.	O
</s>
<s>
A	O
number	O
of	O
operating	O
systems	O
,	O
graphical	O
programs	O
,	O
and	O
websites	O
offer	O
dark	O
modes	O
,	O
which	O
serves	O
a	O
similar	O
purpose	O
as	O
what	O
was	O
originally	O
true	O
video	O
and	O
is	O
now	O
reverse	B-General_Concept
video	I-General_Concept
in	O
modern	O
systems	O
.	O
</s>
