TIFF Tag FillOrder
|Code||266 (hex 0x010A)|
|Default||1 (lower column values in higher order bits)|
The logical order of bits within a byte.
The specification defines these values:
1 = pixels with lower column values are stored in the higher-order bits of the byte.
2 = pixels with lower column values are stored in the lower-order bits of the byte.
The specification goes on to warn that FillOrder=2 should not be used in some cases to avoid ambiguity, and that support for FillOrder=2 is not required in Baseline TIFF compliant readers.
LibTiff defines these values:
FILLORDER_MSB2LSB = 1;
FILLORDER_LSB2MSB = 2;
In practice, the use of FillOrder=2 is very uncommon, and is not recommended.