这里定义的Photoes，对我来说就是BMP, JPG, TIF, 和CR2 (Canon RAW)。至于NEF之类的，暂不在我考虑范围。
首先是EXIF信息。具体Specification参见：http://www.exif.org/specifications.html，可以下载EXIF 2.2标准的PDF。.NET中对应的Image属于System.Drawing namespace。具体的EXIF可以从PropertyItem中读取。
| Label | Shell Key | Hex value | Dec Value | Format ID | Type | Other |
|---|---|---|---|---|---|---|
| Aperture | PKEY_Photo_Aperture | 9202 | 37378 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_ApertureDenominator | 64 | 100 | E1A9A38B-6685-46BD-875E-570DC7AD7320 | UInt32 | ||
| PKEY_Photo_ApertureNumerator | 64 | 100 | 0337ECEC-39FB-4581-A0BD-4C4CC51E9914 | UInt32 | ||
| Brightness | PKEY_Photo_Brightness | 64 | 100 | 1A701BF6-478C-4361-83AB-3701BB053C58 | UInt32 | |
| PKEY_Photo_BrightnessDenominator | 64 | 100 | 6EBE6946-2321-440A-90F0-C043EFD32476 | UInt32 | ||
| PKEY_Photo_BrightnessNumerator | 64 | 100 | 9E7D118F-B314-45A0-8CFB-D654B917C9E9 | UInt32 | ||
| Camera maker | PKEY_Photo_CameraManufacturer | 10F | 271 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | String | |
| PKEY_Photo_CameraModel | PKEY_Photo_CameraModel | 110 | 272 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | String | |
| Camera serial number | PKEY_Photo_CameraSerialNumber | 111 | 273 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | String | |
| Contrast | PKEY_Photo_Contrast | 64 | 100 | 2A785BA9-8D23-4DED-82E6-60A350C86A10 | UInt32 | |
| PKEY_Photo_ContrastText | 64 | 100 | 59DDE9F2-5253-40EA-9A8B-479E96C6249A | String | ||
| Date Taken | PKEY_Photo_DateTaken | 9003 | 36867 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | DateTime | |
| Digital zoom | PKEY_Photo_DigitalZoom | 100 | F85BF840-A925-4BC2-B0C4-8E36B598679E | Double | ||
| PKEY_Photo_DigitalZoomDenominator | 64 | 100 | 745BAF0E-E5C1-4CFB-8A1B-D031A0A52393 | UInt32 | ||
| PKEY_Photo_DigitalZoomNumerator | 64 | 100 | 16CBB924-6500-473B-A5BE-F1599BCBE413 | UInt32 | ||
| Event | PKEY_Photo_Event | 4748 | 18248 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | String | |
| EXIF Version | PKEY_Photo_EXIFVersion | 100 | D35F743A-EB2E-47F2-A286-844132CB1427 | String | ||
| Exposure bias | PKEY_Photo_ExposureBias | 9204 | 37380 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_ExposureBiasDenominator | 100 | AB205E50-04B7-461C-A18C-2F233836E627 | Int32 | |||
| PKEY_Photo_ExposureBiasNumerator | 100 | 738BF284-1D87-420B-92CF-5834BF6EF9ED7 | Int32 | |||
| Exposure index | PKEY_Photo_ExposureIndex | 100 | 967B5AF8-995A-46ED-9E11-35B3C5B9782D | Double | ||
| PKEY_Photo_ExposureIndexDenominator | 100 | 93112F89-C28B-492F-8A9D-4BE2062CEE8A | UInt32 | |||
| PKEY_Photo_ExposureIndexNumerator | 100 | CDEDCF30-8919-44DF-8F4C-4EB2FFDB8D89 | UInt32 | |||
| Exposure program | PKEY_Photo_ExposureProgram | 8822 | 34850 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | UInt32 | |
| PKEY_Photo_ExposureProgramText | 100 | FEC690B7-5F30-4646-AE47-4CAAFBA884A3 | String | |||
| Exposure time | PKEY_Photo_ExposureTime | 829A | 33434 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | 30; 15; 8; 4; 2; 1; 1/2; 1/4; 1/8; 1/15; 1/30; 1/60; 1/125; 1/250; 1/500; 1/1000; 1/2000 |
| PKEY_Photo_ExposureTimeDenominator | 100 | 55E98597-AD16-42E0-B624-21599A199838 | UInt32 | |||
| PKEY_Photo_ExposureTimeNumerator | 100 | 257E44E2-9031-4323-AC38-85C552871B2E | UInt32 | |||
| Flash mode | PKEY_Photo_Flash | 9209 | 37385 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Byte | |
| Flash energy | PKEY_Photo_FlashEnergy | A20B | 41483 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_FlashEnergyDenominator | 100 | D7B61C70-6323-49CD-A5FC-C84277162C97 | UInt32 | |||
| PKEY_Photo_FlashEnergyNumerator | 100 | FCAD3D3D-0858-400F-AAA3-2F66CCE2A6BC | UInt32 | |||
| Flash maker | PKEY_Photo_FlashManufacturer | 100 | AABAF6C9-E0C5-4719-8585-57B103E584FE | String | ||
| Flash model | PKEY_Photo_FlashModel | 100 | FE83BB35-4D1A-42E2-916B-06F3E1AF719E | String | ||
| PKEY_Photo_FlashText | 100 | 6B8B68F6-200B-47EA-8D25-D8050F57339F | String | |||
| F-stop | PKEY_Photo_Fnumber | 829D | 33437 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | 1; 1.4; 2; 2.8; 4; 5.6; 8; 11; 16; 22; 32 |
| PKEY_Photo_FNumberDenominator | 100 | E92A2496-223B-4463-A4E3-30EABBA79D80 | UInt32 | |||
| PKEY_Photo_FNumberNumerator | 100 | 1B97738A-FDFC-462F-9D93-1957E08BE90C | UInt32 | |||
| Focal length | PKEY_Photo_FocalLength | 920A | 37386 | A1-01314B81D5-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_FocalLengthDenominator | 100 | 305BC615-DCA1-44A5-9FD4-10C0BA79412E | UInt32 | |||
| 35mm focal length | PKEY_Photo_FocalLengthInFilm | 100 | A0E74609-B84D-4F49-B860-462BD9971F98 | UInt16 | ||
| PKEY_Photo_FocalLengthNumerator | 100 | 776B6B3B-1E3D-4B0C-9A0E-8FBAF2A8492A | UInt32 | |||
| Focal plane X resolution | PKEY_Photo_FocalPlaneXResolution | 100 | CFC08D97-C6F7-4484-89DD-EBEF4356FE76 | Double | ||
| PKEY_Photo_FocalPlaneXResolutionDenominator | 100 | 0933F3F5-4786-4F46-A8E8-D64DD37FA521 | UInt32 | |||
| PKEY_Photo_FocalPlaneXResolutionNumerator | 100 | DCCB10AF-B4E2-4B88-95F9-031B4D5AB490 | UInt32 | |||
| Focal plane Y resolution | PKEY_Photo_FocalPlaneYResolution | 100 | 4FFFE4D0-914F-4AC4-8D6F-C9C61DE169B1 | Double | ||
| PKEY_Photo_FocalPlaneYResolutionDenominator | 100 | 1D6179A6-A876-4031-B013-3347B2B64DC8 | UInt32 | |||
| PKEY_Photo_FocalPlaneYResolutionNumerator | 100 | A2E541C5-4440-4BA8-867E-75CFC06828CD | UInt32 | |||
| Gain control | PKEY_Photo_GainControl | 100 | FA304789-00C7-4D80-904A-1E4DCC7265AA | Double | ||
| PKEY_Photo_GainControlDenominator | 100 | 42864DFD-9DA4-4F77-BDED-4AAD7B256735 | UInt32 | |||
| PKEY_Photo_GainControlNumerator | 100 | 8E8ECF7C-B7B8-4EB8-A63F-0EE715C96F9E | UInt32 | |||
| PKEY_Photo_GainControlText | 100 | C06238B2-0BF9-4279-A723-25856715CB9D | String | |||
| ISO speed | PKEY_Photo_ISOSpeed | 8827 | 34855 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | UInt16 | |
| Lens maker | PKEY_Photo_LensManufacturer | 100 | E6DDCAF7-29C5-4F0A-9A68-D19412EC7090 | String | ||
| PKEY_Photo_LensModel | 100 | E1277516-2B5F-4869-89B1-2E585BD38B7A | String | |||
| Light source | PKEY_Photo_LightSource | 9208 | 37384 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | UInt32 | |
| PKEY_Photo_MakerNote | 100 | FA303353-B659-4052-85E9-BCAC79549B84 | Buffer | |||
| PKEY_Photo_MakerNoteOffset | 100 | 813F4124-34E6-4D17-AB3E-6B1F3C2247A1 | UInt64 | |||
| Max aperture | PKEY_Photo_MaxAperture | 100 | 08F6D7C2-E3F2-44FC-AF1E-5AA5C81A2D3E | Double | ||
| PKEY_Photo_MaxApertureDenominator | 100 | C77724D4-601F-46C5-9B89-C53F93BCEB77 | UInt32 | |||
| PKEY_Photo_MaxApertureNumerator | 100 | C107E191-A459-44C5-9AE6-B952AD4B906D | UInt32 | |||
| Metering mode | PKEY_Photo_MeteringMode | 9207 | 37383 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | UInt16 | |
| PKEY_Photo_MeteringModeText | 100 | F628FD8C-7BA8-465A-A65B-C5AA79263A9E | String | |||
| Orientation | PKEY_Photo_Orientation | 112 | 274 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | UInt16 | |
| PKEY_Photo_OrientationText | 100 | A9EA193C-C511-498A-A06B-58E2776DCC28 | String | |||
| People | PKEY_Photo_PeopleNames | 100 | E8309B6E-084C-49B4-B1FC-90A80331B638 | String | ||
| Photometric intrepretation | PKEY_Photo_PhotometricInterpretation | 100 | 341796F1-1DF9-4B1C-A564-91BDEFA43877 | UInt16 | ||
| PKEY_Photo_PhotometricInterpretationText | 100 | 821437D6-9EAB-4765-A589-3B1CBBD22A61 | String | |||
| Program mode | PKEY_Photo_ProgramMode | 100 | 6D217F6D-3F6A-4825-B470-5F03CA2FBE9B | UInt32 | ||
| PKEY_Photo_ProgramModeText | 100 | 7FE3AA27-2648-42F3-89B0-454E5CB150C3 | String | |||
| Audio | PKEY_Photo_RelatedSoundFile | 100 | 318A6B45-087F-4DC2-B8CC-05359551FC9E | String | ||
| Saturation | PKEY_Photo_Saturation | 100 | 49237325-A95A-4F67-B211-816B2D45D2E0 | UInt32 | ||
| PKEY_Photo_SaturationText | 100 | 61478C08-B600-4A84-BBE4-E99C45F0A072 | String | |||
| Sharpness | PKEY_Photo_Sharpness | 100 | FC6976DB-8349-4970-AE97-B3C5316A08F0 | UInt32 | ||
| PKEY_Photo_SharpnessText | 100 | 51EC3F47-DD50-421D-8769-334F50424B1E | String | |||
| Shutter speed | PKEY_Photo_ShutterSpeed | 9201 | 37377 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_ShutterSpeedDenominator | 100 | E13D8975-81C7-4948-AE3F-37CAE11E8FF7 | Int32 | |||
| PKEY_Photo_ShutterSpeedNumerator | 100 | 16EA4042-D6F4-4BCA-8349-7C78D30FB333 | Int32 | |||
| Subject distance | PKEY_Photo_SubjectDistance | 9206 | 37382 | 14B81DA1-0135-4D31-96D9-6CBFC9671A99 | Double | |
| PKEY_Photo_SubjectDistanceDenominator | 100 | 0C840A88-B043-466D-9766-D4B26DA3FA77 | UInt32 | |||
| PKEY_Photo_SubjectDistanceNumerator | 100 | 8AF4961C-F526-43E5-AA81-DB768219178D | UInt32 | |||
| Tag view | PKEY_Photo_TagViewAggregate | 100 | B812F15D-C2D8-4BBF-BACD-79744346113F | String | ||
| PKEY_Photo_TranscodedForSync | 100 | 9A8EBB75-6458-4E82-BACB-35C0095B03BB | Boolean | |||
| White balance | PKEY_Photo_WhiteBalance | 100 | EE3D3D8A-5381-4CFA-B13B-AAF66B5F4EC9 | UInt32 | ||
| PKEY_Photo_WhiteBalanceText | 100 | 6336B95E-C7A7-426D-86FD-7AE3D39C84B4 | String |
这里解决不了的一个问题是，读取Lens信息。
而Photoshop却可以完美的解决问题：
核心的问题是在XMP，看看其核心定义：http://www.adobe.com/products/xmp/index.html。
比如Lens信息显示在Photoshop的Photo Info对话框。
而Microsoft提供了一个WIC http://www.microsoft.com/downloads/details.aspx?FamilyID=8e011506-6307-445b-b950-215def45ddd8&displaylang=en 来解决这个问题。MSDN中的WIC根节点：http://msdn.microsoft.com/en-us/library/ee719902(VS.85).aspx。.NET中对应的Namespace: System.Windows.Media.Imaging。
By Alva Chien 2010.04.15