EXIFIFD

EXIFIFD refers to the Exchangeable image file format (EXIF) file format directory. EXIF is a standard that specifies the formats for images, sound, and text which are used by digital cameras, including a camera's settings and location. Within an EXIF file, information is stored in a hierarchical structure. The IFD, or Image File Directory, is a fundamental component of this structure. Essentially, an IFD acts as a table of contents for a specific set of metadata within the EXIF data.

Each IFD contains a list of tags, where each tag represents a piece of metadata. These tags are identified by a unique number and have an associated data type and value. For instance, there might be tags for the camera model, exposure time, aperture, date and time the photo was taken, and GPS coordinates. Multiple IFDs can exist within a single EXIF file to organize different categories of information. For example, there could be a main IFD for general image information, and other IFDs for thumbnail images or specific camera maker notes. Software applications that read EXIF data parse these IFDs to extract and display the metadata associated with an image.