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epinfo - extract technical information from digital camera generated
files
epinfo [-h] [-V] [-z] [-r] [-t] [-f fmt] [-T <TagName>] <filename>
...
The images downloaded from a digital camera usually contain a considerable
amount of textual information about the way the picture was taken, and
other details.
This command extracts the contents of the TIFF directory of
Exif files or APP12 marker from JFIF files, parses it and optionally finds
specific data inside it. If used without -T, -r and -t options, dumps the
complete block data in human readable format. With -r and -t options, renames
and changes timestamp of the files.
- -h
- This option produces
a help screen of all options and commands.
- -V
- This option prints software
revision information.
- -z
- This option sets no time-zone processing mode.
Use this option if the camera's clock is set up shifted by the local timezone
offset (as it is when you set it manually to the local time).
- -r
- Rename
files, generating new name based on the time of snapshot and -f option
value.
- -t
- Set timestamp of the files to the time of snapshots.
- -f timeformat
- This option allows to specify the format for automatically generated
image file names; the value is used as the format string for strftime(3)
function. By default, names of the format "MMDD_NNN.jpg" are generated,
where MM is a month, DD is a day, and NNN is a count starting from 001.
A good starting point for the timeformat value could be "%Y_%m_%d-%H_%M_%S.jpg".
If the format string contains context "%%XXXd" where XXX are digits,
it is taken for the count, i.e. if the file with such name is present, next
count is tried. If the format string does not contain "%%XXXd" part, the
count field, if necessary, is appended at the end of the name.
A few single-character
formats are used as shortcuts. "x" makes the name of seconds since the
epoch in hexadecimal format (8 characters + ".jpg"), "d" - the same in decimal
format (10 characters), "1" stands for default format "%m%d_%%03d.jpg",
"2" stands for "%y%m%d%%02d.jpg", "3" stands for "%Y_%m_%d-%H_%M_%S.jpg"
and 4 stands for "%Y/%m/%d/%H_%M_%S.jpg". The program attempts to create
intermediate directories is necessary (and possible).
- -T <TagName>
- Output
the value of this keyword in the information block. Note that keywords
are case sensitive. TagName DateTime has special meaning: if the file
is Exif, it just prints the value of DateTime tag, and if the format is
old APP12, it outputs the value of TimeDate tag in the same format as
Exif DateTime.
- <filename> ...
- List of filenames to process.
% epinfo -f3 -rt pic00001.jpg
% epinfo -T FNumber 0512_003.jpg
The latest version of this tool can be found at ftp://ftp.average.org/pub/photopc/;
see also WWW page at http://www.average.org/digicam/.
Trademarks are properties
of their respective owners.
The program is copyrighted by
Eugene G. Crosser <crosser@average.org> and freely distributable. See README
file for details.
photopc(1)
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