<s>
The	O
Sigma	B-Algorithm
SD15	I-Algorithm
is	O
an	O
updated	O
version	O
of	O
Sigma	B-Algorithm
SD14	I-Algorithm
DSLR	B-Device
produced	O
by	O
the	O
Sigma	O
Corporation	O
of	O
Japan	O
and	O
featuring	O
the	O
improved	O
TRUE	O
II	O
image	O
processing	O
engine	O
,	O
but	O
with	O
the	O
same	O
image	O
sensor	O
as	O
its	O
predecessor	O
.	O
</s>
<s>
As	O
such	O
,	O
the	O
SD15	B-Algorithm
features	O
the	O
4.7	O
MP	O
Foveon	B-Algorithm
X3	I-Algorithm
sensor	I-Algorithm
.	O
</s>
<s>
It	O
is	O
Sigma	O
's	O
fourth	O
DSLR	B-Device
since	O
the	O
SD9	B-Algorithm
from	O
2002	O
.	O
</s>
<s>
There	O
is	O
some	O
dispute	O
over	O
the	O
15.0	O
MP	O
claim	O
made	O
by	O
Sigma	O
,	O
resulting	O
from	O
the	O
major	O
differences	O
between	O
the	O
industry	O
standard	O
Bayer	B-Algorithm
sensor	I-Algorithm
used	O
in	O
all	O
other	O
digital	O
cameras	O
,	O
and	O
the	O
Foveon	B-Algorithm
X3	I-Algorithm
full-color	O
image	O
sensor	O
used	O
almost	O
exclusively	O
in	O
Sigma	O
cameras	O
.	O
</s>
<s>
Since	O
the	O
Foveon	O
sensor	O
captures	O
images	O
via	O
a	O
three-layer	O
red	O
,	O
green	O
,	O
blue	O
silicone	O
array	O
similar	O
to	O
the	O
three-layer	O
technology	O
used	O
in	O
Technicolor	O
film	O
,	O
rather	O
than	O
the	O
single-layer	O
color	O
interpolation	O
method	O
used	O
by	O
Bayer	B-Algorithm
sensors	I-Algorithm
,	O
Sigma	O
and	O
Foveon	O
count	O
each	O
RGB	O
layer	O
separately	O
,	O
so	O
4.7	O
MP	O
times	O
3	O
translates	O
to	O
their	O
15.0	O
MP	O
claims	O
.	O
</s>
<s>
While	O
the	O
SD15	B-Algorithm
retains	O
the	O
image	O
sensor	O
from	O
its	O
predecessor	O
,	O
it	O
includes	O
the	O
improved	O
TRUE	O
II	O
image	O
processing	O
engine	O
that	O
was	O
already	O
implemented	O
in	O
the	O
Sigma	B-Device
DP2	I-Device
.	O
</s>
<s>
The	O
SD15	B-Algorithm
also	O
features	O
a	O
larger	O
,	O
higher	O
resolution	O
LCD	O
screen	O
.	O
</s>
<s>
The	O
SD15	B-Algorithm
also	O
introduced	O
Color	O
Modes	O
.	O
</s>
<s>
The	O
storage	O
medium	O
was	O
changed	O
from	O
a	O
CF	B-Device
card	I-Device
to	O
an	O
SD	B-Device
card	I-Device
.	O
</s>
<s>
Version	O
6.x	O
is	O
free	O
Download	O
for	O
Windows	O
7+	O
and	O
Mac	B-Application
OS	I-Application
Version	O
10.7	O
+	O
(	O
6.3.x	O
)	O
.	O
</s>
