php – 读取EXIF并确定闪存是否已经触发

发布时间：2020-12-13 22:22:39 所属栏目：PHP教程来源：网络整理

导读：我一直在用 PHP脚本阅读一些EXIF数据.如果使用了闪光灯,我想确定某个图像.以下是EXIF阅读器返回的值 0x0 = No Flash0x1 = Fired0x5 = Fired,Return not detected0x7 = Fired,Return detected0x8 = On,Did not fire0x9 = On,Fired0xd = On,Return not detecte

我一直在用 PHP脚本阅读一些EXIF数据.如果使用了闪光灯,我想确定某个图像.以下是EXIF阅读器返回的值

0x0     = No Flash
0x1     = Fired
0x5     = Fired,Return not detected
0x7     = Fired,Return detected
0x8     = On,Did not fire
0x9     = On,Fired
0xd     = On,Return not detected
0xf     = On,Return detected
0x10    = Off,Did not fire
0x14    = Off,Did not fire,Return not detected
0x18    = Auto,Did not fire
0x19    = Auto,Fired
0x1d    = Auto,Fired,Return not detected
0x1f    = Auto,Return detected
0x20    = No flash function
0x30    = Off,No flash function
0x41    = Fired,Red-eye reduction
0x45    = Fired,Red-eye reduction,Return not detected
0x47    = Fired,Return detected
0x49    = On,Red-eye reduction
0x4d    = On,Return not detected
0x4f    = On,Return detected
0x50    = Off,Red-eye reduction
0x58    = Auto,Red-eye reduction
0x59    = Auto,Red-eye reduction
0x5d    = Auto,Return not detected
0x5f    = Auto,Return detected

哪一个意味着闪光灯已被使用？

最好的祝福,
Mladjo

解决方法

我相信如果您将十六进制值转换为二进制,则最右边的数字表示闪存是否实际触发.

因此：

+-------------------------------------------------------+------+----------+-------+
|                        Status                         | Hex  |  Binary  | Fired |
+-------------------------------------------------------+------+----------+-------+
| No Flash                                              | 0x0  | 00000000 | No    |
| Fired                                                 | 0x1  | 00000001 | Yes   |
| "Fired,Return not detected"                          | 0x5  | 00000101 | Yes   |
| "Fired,Return detected"                              | 0x7  | 00000111 | Yes   |
| "On,Did not fire"                                    | 0x8  | 00001000 | No    |
| "On,Fired"                                           | 0x9  | 00001001 | Yes   |
| "On,Return not detected"                             | 0xd  | 00001011 | Yes   |
| "On,Return detected"                                 | 0xf  | 00001111 | Yes   |
| "Off,Did not fire"                                   | 0x10 | 00010000 | No    |
| "Off,Return not detected"              | 0x14 | 00010100 | No    |
| "Auto,Did not fire"                                  | 0x18 | 00011000 | No    |
| "Auto,Fired"                                         | 0x19 | 00011001 | Yes   |
| "Auto,Return not detected"                    | 0x1d | 00011101 | Yes   |
| "Auto,Return detected"                        | 0x1f | 00022222 | Yes   |
|  No flash function                                    | 0x20 | 00100000 | No    |
| "Off,No flash function"                              | 0x30 | 00110000 | No    |
| "Fired,Red-eye reduction"                            | 0x41 | 01000001 | Yes   |
| "Fired,Return not detected"       | 0x45 | 01000101 | Yes   |
| "Fired,Return detected"           | 0x47 | 01000111 | Yes   |
| "On,Red-eye reduction"                               | 0x49 | 01001001 | Yes   |
| "On,Return not detected"          | 0x4d | 01001101 | Yes   |
| "On,Return detected"              | 0x4f | 01001111 | Yes   |
| "Off,Red-eye reduction"                              | 0x50 | 01010000 | No    |
| "Auto,Red-eye reduction"               | 0x58 | 01011000 | No    |
| "Auto,Red-eye reduction"                      | 0x59 | 01011001 | Yes   |
| "Auto,Return not detected" | 0x5d | 01011101 | Yes   |
| "Auto,Return detected"     | 0x5f | 01022222 | Yes   |
+-------------------------------------------------------+------+----------+-------+

（编辑：李大同）

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