| フィールド | 型 | コメント |
| BlockWidth | UB[4] |
Pixel width of each block in the grid. This value is stored as (actualWidth / 16) - 1, so possible block sizes are a multiple of 16 and not more than 256. |
| ImageWidth | UB[12] | Pixel width of the full image. |
| BlockHeight | UB[4] |
Pixel height of each block in the grid. This value is stored as (actualHeight / 16) - 1, so possible block sizes are a multiple of 16 and not more than 256. |
| ImageHeight | UB[12] | Pixel height of the full image. |
| ImageBlocks | IMAGEBLOCK[n] |
Blocks of image data. See preceding for details of how to calculate n. Blocks are ordered from bottom left to top right, in rows. |
| フィールド | 型 | コメント |
| DataSize UB[16] |
Note: UB[16] is not the same as UI16; no byte swapping occurs. |
Size of the compressed block data that follows. If this is an interframe, and this block is not changed since the last keyframe, DataSize is 0 and the Data field is absent. |
| Data |
If DataSize > 0, UI8[DataSize] |
Pixel data compressed using ZLIB. Pixels are ordered from bottom left to top right in rows. Each pixel is three bytes: B, G, R. |
