<s>
In	O
packed	B-General_Concept
pixel	I-General_Concept
or	O
chunky	B-General_Concept
framebuffer	B-Algorithm
organization	O
,	O
the	O
bits	O
defining	O
each	O
pixel	B-Algorithm
are	O
clustered	O
and	O
stored	O
consecutively	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
there	O
are	O
16	O
bits	O
per	O
pixel	B-Algorithm
,	O
each	O
pixel	B-Algorithm
is	O
represented	O
in	O
two	O
consecutive	O
(	O
contiguous	O
)	O
8-bit	O
bytes	O
in	O
the	O
framebuffer	B-Algorithm
.	O
</s>
<s>
If	O
there	O
are	O
4	O
bits	O
per	O
pixel	B-Algorithm
,	O
each	O
framebuffer	B-Algorithm
byte	O
defines	O
two	O
pixels	B-Algorithm
,	O
one	O
in	O
each	O
nibble	O
.	O
</s>
<s>
The	O
latter	O
example	O
is	O
as	O
opposed	O
to	O
storing	O
a	O
single	O
4-bit	O
pixel	B-Algorithm
in	O
a	O
byte	O
,	O
leaving	O
4	O
bits	O
of	O
the	O
byte	O
unused	O
.	O
</s>
<s>
If	O
a	O
pixel	B-Algorithm
has	O
more	O
than	O
one	O
channel	B-Algorithm
,	O
the	O
channels	O
are	O
interleaved	O
when	O
using	O
packed	B-General_Concept
pixel	I-General_Concept
organization	O
.	O
</s>
<s>
Packed	B-General_Concept
pixel	I-General_Concept
displays	O
were	O
common	O
on	O
early	O
microcomputer	B-Architecture
system	O
that	O
shared	O
a	O
single	O
main	O
memory	O
for	O
both	O
the	O
central	B-General_Concept
processing	I-General_Concept
unit	I-General_Concept
(	O
CPU	O
)	O
and	O
display	O
driver	O
.	O
</s>
<s>
In	O
such	O
systems	O
,	O
memory	O
was	O
normally	O
accessed	O
a	O
byte	O
at	O
a	O
time	O
,	O
so	O
by	O
packing	O
the	O
pixels	B-Algorithm
,	O
the	O
display	O
system	O
could	O
read	O
out	O
several	O
pixels	B-Algorithm
worth	O
of	O
data	O
in	O
a	O
single	O
read	O
operation	O
.	O
</s>
<s>
Packed	B-General_Concept
pixel	I-General_Concept
is	O
one	O
of	O
two	O
major	O
ways	O
to	O
organize	O
graphics	O
data	O
in	O
memory	O
,	O
the	O
other	O
being	O
planar	B-Device
organization	O
,	O
where	O
each	O
pixel	B-Algorithm
is	O
made	O
of	O
individual	O
bits	O
stored	O
in	O
their	O
own	O
plane	O
.	O
</s>
<s>
For	O
a	O
4-bit	O
color	O
value	O
,	O
memory	O
would	O
be	O
organized	O
as	O
four	O
screen-sized	O
planes	O
of	O
one	O
bit	O
each	O
and	O
a	O
single	O
pixel	B-Algorithm
's	O
value	O
built	O
up	O
by	O
selecting	O
the	O
appropriate	O
bit	O
from	O
each	O
plane	O
.	O
</s>
<s>
Planar	B-Device
organization	O
has	O
the	O
advantage	O
that	O
the	O
data	O
can	O
be	O
accessed	O
in	O
parallel	O
,	O
and	O
is	O
used	O
when	O
memory	O
bandwidth	O
is	O
an	O
issue	O
.	O
</s>
