EXIF 轉向標籤的定義網頁：Exif Orientation Page
有點不好理解，所以來重構…
表一：以 Orientation Tag 記錄圖形轉向
| Phase\O. Tag | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Phase #0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| Phase #1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Phase #2 | 1 | 2 | 3 | 4 | 5 | 8 | 7 | 6 |
| Phase #3 | 1 | 1 | 1 | 1 | 1 | 3 | 1 | 3 |
| Phase #4 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
表二：以 R 代表圖形往右旋轉 90°， M 代表左右 180° 相反的鏡射，記錄圖形轉向
| Phase\O. Tag |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Phase #0 | x | x | x | x | x | x | x | x |
| Phase #1 | x | M | RR | MRR | MRRR | R | MR | RRR |
| Phase #2 | x | M | RR | MRR | MRRR | R | MR | RRR |
| Phase #3 | x | M | RR | MRR | MRRR | R | MR | RRR |
| Phase #4 | x | M | RR | MRR | MRRR | R | MR | RRR |
表三：以 R 和 M 記錄圖形轉向
| Rotate\O. Tag |
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| x | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| R | 8 | 7 | 6 | 5 | 2 | 1 | 4 | 3 |
| RR | 3 | 4 | 1 | 2 | 7 | 3 | 5 | 6 |
| RRR | 6 | 5 | 8 | 7 | 4 | 8 | 2 | 1 |
| M | 2 | 1 | 4 | 3 | 8 | 7 | 6 | 5 |
| MR | 7 | 8 | 5 | 6 | 3 | 4 | 1 | 2 |
| MRR | 4 | 3 | 2 | 1 | 6 | 5 | 3 | 7 |
| MRRR | 5 | 6 | 7 | 8 | 1 | 2 | 8 | 4 |
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