movii
6/29/2017 - 12:08 PM

笔记:使用 JavaScript 读取 JPEG 文件 EXIF 中的 Orientation - 4. Brief on Exif's IFD(Image File Directory):

笔记:使用 JavaScript 读取 JPEG 文件 EXIF 中的 Orientation - 4. Brief on Exif's IFD(Image File Directory):

>> Exif's IFD(Image File Directory):
+------+---------------------------+
| Exif |            ···            |
+      +---------------------------+
|      | IFD0 |        XXXX        |
+      +      +--------------------+
|      |      |       entry 1      |
+      +      +--------------------+
|      |      |       entry n      |
+      +      +--------------------+
|      |      | offset to next IFD |
+      +------+--------------------+
|      |            ···            |
+------+---------------------------+