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On the top is a normal 2BPP tile. This represents the letter "A".
On the bottom is the same tile, de-compressed. An "A".
Example: Normal 2BPP has 4 colors. The decompressed tile has 2.
(imagine r=red, b=blue, g=green, x=black, w=white) |x
b b b b x b b|
|x b b
r r r b b|
|x b
g r r r
g b|
|x b
g r r r
g g|
|x g g
r x x
g g|
|x g
r x
x x
g r|
|x r r
x x
r r r|
|x r r r r r r r|
-----------------
|x
x x
x x
x x
x|
|x
x x
w w w x
x|
|x
x w w w w w
x|
|x
x w w w w w w|
|x
w w w x
x w w|
|x
w w x
x x
w w|
|x
w w x
x w w w|
|x
w w w w w w w|
|x
w w w w x
w w|
|x
w w x
x x
w w|
|x
w w x
x x
w w|
|x w w
x x
x w w|
|x
w w x
x x
w w|
|x
w x
x x
x w
x|
|x x
x x
x x
x x|
|x x
x x
x x
x x|
|