|Extension TIFF Tag TileLength|
TIFF Tag Reference
TIFF Tag TileLength
The tile length (height) in pixels. This is the number of rows in each tile.
Assuming integer arithmetic, three computed values that are useful in the following field descriptions are:
TileLength must be a multiple of 16. This restriction improves performance in some graphics environments and enhances compatibility with compression schemes such as JPEG. Tiles need not be square.