<s>
False	B-Application
color	I-Application
(	O
or	O
pseudo	O
color	O
)	O
refers	O
to	O
a	O
group	O
of	O
color	O
rendering	O
methods	O
used	O
to	O
display	O
images	O
in	O
color	O
which	O
were	O
recorded	O
in	O
the	O
visible	O
or	O
non-visible	O
parts	O
of	O
the	O
electromagnetic	O
spectrum	O
.	O
</s>
<s>
A	O
false-color	B-Application
image	I-Application
is	O
an	O
image	O
that	O
depicts	O
an	O
object	O
in	O
colors	O
that	O
differ	O
from	O
those	O
a	O
photograph	O
(	O
a	O
true-color	O
image	O
)	O
would	O
show	O
.	O
</s>
<s>
In	O
addition	O
,	O
variants	O
of	O
false	B-Application
color	I-Application
such	O
as	O
pseudocolor	O
,	O
density	B-Application
slicing	I-Application
,	O
and	O
choropleths	O
are	O
used	O
for	O
information	B-Application
visualization	I-Application
of	O
either	O
data	O
gathered	O
by	O
a	O
single	O
grayscale	O
channel	O
or	O
data	O
not	O
depicting	O
parts	O
of	O
the	O
electromagnetic	O
spectrum	O
(	O
e.g.	O
</s>
<s>
The	O
concept	O
behind	O
true	O
color	O
can	O
help	O
in	O
understanding	O
false	B-Application
color	I-Application
.	O
</s>
<s>
a	O
printer	O
or	O
monitor	B-Device
)	O
.	O
</s>
<s>
In	O
contrast	O
to	O
a	O
true-color	O
image	O
,	O
a	O
false-color	B-Application
image	I-Application
sacrifices	O
natural	O
color	O
rendition	O
in	O
order	O
to	O
ease	O
the	O
detection	O
of	O
features	O
that	O
are	O
not	O
readily	O
discernible	O
otherwise	O
–	O
for	O
example	O
the	O
use	O
of	O
near	O
infrared	O
for	O
the	O
detection	O
of	O
vegetation	O
in	O
satellite	O
images	O
.	O
</s>
<s>
While	O
a	O
false-color	B-Application
image	I-Application
can	O
be	O
created	O
using	O
solely	O
the	O
visual	O
spectrum	O
(	O
e.g.	O
</s>
<s>
infrared	O
,	O
ultraviolet	B-Application
or	O
X-ray	B-Library
)	O
.	O
</s>
<s>
As	O
the	O
human	O
eye	O
uses	O
three	O
spectral	O
bands	O
(	O
see	O
trichromacy	O
for	O
details	O
)	O
,	O
three	O
spectral	O
bands	O
are	O
commonly	O
combined	O
into	O
a	O
false-color	B-Application
image	I-Application
.	O
</s>
<s>
At	O
least	O
two	O
spectral	O
bands	O
are	O
needed	O
for	O
a	O
false-color	B-Application
encoding	O
,	O
and	O
it	O
is	O
possible	O
to	O
combine	O
more	O
bands	O
into	O
the	O
three	O
visual	O
RGB	O
bands	O
–	O
with	O
the	O
eye	O
's	O
ability	O
to	O
discern	O
three	O
channels	O
being	O
the	O
limiting	O
factor	O
.	O
</s>
<s>
For	O
false	B-Application
color	I-Application
this	O
relationship	O
is	O
changed	O
.	O
</s>
<s>
The	O
simplest	O
false-color	B-Application
encoding	O
is	O
to	O
take	O
an	O
RGB	O
image	O
in	O
the	O
visible	O
spectrum	O
,	O
but	O
map	O
it	O
differently	O
,	O
e.g.	O
</s>
<s>
For	O
traditional	O
false-color	B-Application
satellite	O
images	O
of	O
Earth	O
a	O
"	O
NRG	O
→	O
RGB	O
"	O
mapping	O
is	O
used	O
,	O
with	O
"	O
N	O
"	O
being	O
the	O
near-infrared	O
spectral	O
band	O
(	O
and	O
the	O
blue	O
spectral	O
band	O
being	O
unused	O
)	O
–	O
this	O
yields	O
the	O
typical	O
"	O
vegetation	O
in	O
red	O
"	O
false-color	B-Application
images	I-Application
.	O
</s>
<s>
False	B-Application
color	I-Application
is	O
used	O
(	O
among	O
others	O
)	O
for	O
satellite	O
and	O
space	O
images	O
:	O
Examples	O
are	O
remote	B-Application
sensing	I-Application
satellites	I-Application
(	O
e.g.	O
</s>
<s>
the	O
Mars	B-Application
Science	O
Laboratory	O
Curiosity	O
)	O
being	O
the	O
most	O
prominent	O
examples	O
,	O
have	O
the	O
ability	O
to	O
capture	O
approximate	O
true-color	O
images	O
as	O
well	O
.	O
</s>
<s>
False	B-Application
color	I-Application
has	O
a	O
range	O
of	O
scientific	O
applications	O
.	O
</s>
<s>
Spacecraft	O
often	O
employ	O
false-color	B-Application
methods	O
to	O
help	O
understand	O
the	O
composition	O
of	O
structures	O
in	O
the	O
universe	O
such	O
as	O
nebula	O
and	O
galaxies	O
.	O
</s>
<s>
On	O
26	O
October	O
2004	O
,	O
the	O
NASA/ESA	O
Cassini-Huygens	O
spacecraft	O
captured	O
a	O
false-color	B-Application
image	I-Application
of	O
Titan	O
,	O
Saturn	O
's	O
largest	O
moon	O
.	O
</s>
<s>
The	O
image	O
was	O
captured	O
in	O
Ultraviolet	B-Application
and	O
Infrared	O
wavelengths	O
,	O
both	O
invisible	O
to	O
the	O
human	O
eye	O
.	O
</s>
<s>
In	O
order	O
to	O
provide	O
a	O
visual	O
representation	O
,	O
false	B-Application
color	I-Application
techniques	O
were	O
used	O
.	O
</s>
<s>
The	O
infrared	O
data	O
was	O
mapped	O
to	O
red	O
and	O
green	O
colors	O
,	O
and	O
ultraviolet	B-Application
mapped	O
to	O
blue	O
.	O
</s>
<s>
A	O
pseudocolor	O
image	O
(	O
sometimes	O
styled	O
pseudo-color	B-Application
or	O
pseudo	O
color	O
)	O
is	O
derived	O
from	O
a	O
grayscale	O
image	O
by	O
mapping	O
each	O
intensity	O
value	O
to	O
a	O
color	O
according	O
to	O
a	O
table	O
or	O
function	O
.	O
</s>
<s>
temperature	O
,	O
elevation	O
,	O
soil	O
composition	O
,	O
tissue	O
type	O
,	O
and	O
so	O
on	O
)	O
,	O
in	O
contrast	O
to	O
false	B-Application
color	I-Application
which	O
is	O
commonly	O
used	O
to	O
display	O
three	O
channels	O
of	O
data	O
.	O
</s>
<s>
Pseudocoloring	O
can	O
make	O
some	O
details	O
more	O
visible	O
,	O
as	O
the	O
perceived	O
difference	O
in	O
color	B-Algorithm
space	I-Algorithm
is	O
bigger	O
than	O
between	O
successive	O
gray	O
levels	O
alone	O
.	O
</s>
<s>
A	O
typical	O
example	O
for	O
the	O
use	O
of	O
pseudo	O
color	O
is	O
thermography	B-Algorithm
(	O
thermal	O
imaging	O
)	O
,	O
where	O
infrared	O
cameras	O
feature	O
only	O
one	O
spectral	O
band	O
and	O
show	O
their	O
grayscale	O
images	O
in	O
pseudo	O
color	O
.	O
</s>
<s>
Density	B-Application
slicing	I-Application
,	O
a	O
variation	O
of	O
pseudo	O
color	O
,	O
divides	O
an	O
image	O
into	O
a	O
few	O
colored	O
bands	O
and	O
is	O
(	O
among	O
others	O
)	O
used	O
in	O
the	O
analysis	O
of	O
remote	B-Application
sensing	I-Application
images	O
.	O
</s>
<s>
For	O
density	B-Application
slicing	I-Application
the	O
range	O
of	O
grayscale	O
levels	O
is	O
divided	O
into	O
intervals	O
,	O
with	O
each	O
interval	O
assigned	O
to	O
one	O
of	O
a	O
few	O
discrete	O
colors	O
–	O
this	O
is	O
in	O
contrast	O
to	O
pseudo	O
color	O
,	O
which	O
uses	O
a	O
continuous	O
color	O
scale	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
a	O
grayscale	O
thermal	B-Algorithm
image	I-Algorithm
the	O
temperature	O
values	O
in	O
the	O
image	O
can	O
be	O
split	O
into	O
bands	O
of	O
2°C	O
,	O
and	O
each	O
band	O
represented	O
by	O
one	O
color	O
–	O
as	O
a	O
result	O
the	O
temperature	O
of	O
one	O
spot	O
in	O
the	O
thermograph	O
can	O
be	O
easier	O
acquired	O
by	O
the	O
user	O
,	O
because	O
the	O
discernible	O
differences	O
between	O
the	O
discrete	O
colors	O
are	O
greater	O
than	O
those	O
of	O
images	O
with	O
continuous	O
grayscale	O
or	O
continuous	O
pseudo	O
color	O
.	O
</s>
<s>
Basically	O
it	O
is	O
density	B-Application
slicing	I-Application
applied	O
to	O
a	O
pseudocolor	O
overlay	O
.	O
</s>
<s>
A	O
choropleth	O
map	O
of	O
a	O
geographic	O
area	O
is	O
thus	O
an	O
extreme	O
form	O
of	O
false	B-Application
color	I-Application
.	O
</s>
<s>
While	O
artistic	O
rendition	O
lends	O
to	O
subjective	O
expression	O
of	O
color	O
,	O
Andy	O
Warhol	O
(	O
1928	O
–	O
1987	O
)	O
has	O
become	O
a	O
culturally	O
significant	O
figure	O
of	O
the	O
modern	O
art	O
movement	O
by	O
creating	O
false-color	B-Application
paintings	O
with	O
screen	O
printing	O
techniques	O
.	O
</s>
<s>
The	O
colors	O
of	O
ink	O
were	O
selected	O
through	O
experimentation	O
of	O
aesthetics	O
and	O
do	O
not	O
correlate	O
to	O
false-color	B-Application
rendering	O
of	O
the	O
electromagnetic	O
spectrum	O
employed	O
in	O
remote	B-Application
sensing	I-Application
image	O
processing	O
.	O
</s>
<s>
For	O
years	O
the	O
artist	O
continued	O
screen	O
printing	O
false-color	B-Application
images	I-Application
of	O
Marilyn	O
Monroe	O
,	O
perhaps	O
his	O
most	O
referenced	O
work	O
being	O
Turquoise	O
Marilyn	O
which	O
was	O
bought	O
in	O
May	O
2007	O
by	O
a	O
private	O
collector	O
for	O
80	O
million	O
US	O
dollars	O
.	O
</s>
