JEITA  CP-3451  Explication - 139 - 7.3.8    WhiteBalance Tag Information This tag indicates the white balance set when the image was shot. [Writer] |If white balance is determined automatically, 0 (auto white balance) is recorded. |If preset, custom setting, or while balance auto-bracketing is set, 1 (manual white balance) is recorded. [Reader] |If 0 (auto white balance) is recorded, color balance should be adjusted automatically. The reader may use the light source tag as additional information when performing the adjustment. |If 1 (manual white balance) is indicated, either normal color balance should not be adjusted automatically or the adjustment level should be reduced. 7.3.9    DigitalZoomRatio Tag Information This tag indicates the digital zoom ratio when the image was shot. [Reader] |This information can be used as additional information for zoom processing when converting resolution. 7.3.10    FocalLengthln35mmFilm Tag Information This tag indicates the equivalent focal length assuming a 35mm film camera. [Writer] |Digital zoom ratio is not taken into account.   [Reader] |A reader can use this value along with subject distance to estimate the magnification. 7.3.11    SceneCaptureType Tag Information This tag indicates the type of scene that was shot. It can also be used to set the mode in which the image was shot.   [Writer] |The writer records the shooting mode set by the user or the scene type determined by the writer.   |A value of 1 (landscape) indicates a mode suitable for shooting scenery, 2 (portrait) means a mode suitable for portrait photography, and 3(night scene) means a mode suitable for night scenes was set. [Reader] |The reader can use this information to perform image processing suitable for the type of scene that was shot. |The reader should use this tag and the image analysis result, or other related tags, to prevent over-correction or processing that defeats the purpose of the recorded values.