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ExifTool is a free and open-source software program for reading, writing, and manipulating image, audio, video, and PDF metadata. As such, ExifTool classes as a tag editor . It is platform independent , available as both a Perl library (Image::ExifTool) and a command-line application.
Date and time 2003:08:11 16:45:32 YCbCr positioning centered Compression JPEG compression X resolution 72.00 Y resolution 72.00 Resolution unit Inch Exposure time 1/659 s F-number f/4.0 Exposure program Normal program Exif version Exif version 2.1 Date and time (original) 2003:08:11 16:45:32 Date and time (digitized) 2003:08:11 16:45:32
The last modification date stamp (and with DELWATCH 2.0+ also the file deletion date stamp, and since DOS 7.0+ optionally also the last access date stamp and creation date stamp), are stored in the directory entry with the year represented as an unsigned seven bit number (0–127), relative to 1980, and thereby unable to indicate any dates in ...
The difference is an exact number of quarters of an hour up to 95 (same minutes modulo 15 and seconds) if the file was transported across zones; there is also a one-hour difference within a single zone caused by the transition between standard time and daylight saving time (DST). Some, but not all, file comparison and synchronisation software ...
MAC times are pieces of file system metadata which record when certain events pertaining to a computer file occurred most recently. The events are usually described as "modification" (the data in the file was modified), "access" (some part of the file was read), and "metadata change" (the file's permissions or ownership were modified), although the acronym is derived from the "mtime", "atime ...
Raw files contain the information required to produce a viewable image from the camera's sensor data. The structure of raw files often follows a common pattern: A short file header which typically contains an indicator of the byte-ordering of the file, a file identifier and an offset into the main file data
A delta can be defined in 2 ways, symmetric delta and directed delta.A symmetric delta can be expressed as (,) = (),where and represent two versions.. A directed delta, also called a change, is a sequence of (elementary) change operations which, when applied to one version , yields another version (note the correspondence to transaction logs in databases).
When a file is deleted, the meta-information about this file (filename, date/time, size, location of the first data block/cluster, etc.) is lost; e.g., in an ext3/ext4 filesystem, the names of deleted files are still present, but the location of the first data block is removed.