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findimagedupes - Finds visually similar or duplicate images


findimagedupes [option ...] [--] [ - | [file ...] ]

-f, --fingerprints=FILE -c, --collection=FILE
-M, --merge=FILE -p, --program=PROGRAM
-P, --prune -s, --script=FILE
-a, --add -i, --include=TEXT
-r, --rescan -I, --include-file=FILE
-n, --no-compare
-q, --quiet
-t, --threshold=AMOUNT -v, --verbosity=LIST

-0, --null -h, --help
-R, --recurse --man

With no options, compares the specified files and does not use nor update any fingerprint

Directories of images may be specified instead of individual files; Sub-directories of
these are not searched unless --recurse is used.


-0, --null
If a file "-" is given, a list of files is read from stdin.

Without -0, the list is specified one file per line, such as produced by find(1)
with its "-print" option.

With -0, the list is expected to be null-delimited, such as produced by find(1)
with its "-print0" option.

-a, --add
Only look for duplicates of files specified on the commandline.

Matches are also sought in any fingerprint databases specified.

-c, --collection=FILE
Create GQView collection FILE.gqv of duplicates.

The program attempts to produce well-formed collections. In particular, it will
print a warning and exclude any file whose name contains newline or doublequote.
(In this situation, gqview(1) seems to create a .gqv collection file that it
silently fails to read back in properly.)

-d, --debug=OPTS
Enable debugging output. Options OPTS are subject to change. See the program
source for details.

-f, --fingerprints=FILE
Use FILE as fingerprint database.

May be abbreviated as --fp or --db.

This option may be given multiple times when --merge is used. (Note: FILE could
contain commas, so multiple databases may not be specified as a single comma-
delimited list.)

-h, --help
Print usage and option sections of this manual.

-i, --include=TEXT
TEXT is Bourne-shell code to customise --script.

It is executed after any code included using --include-file.

May be given multiple times. Code will be concatenated.

-I, --include-file=FILE
FILE is a file containing Bourne-shell code to customise --script.

It is executed before any code included using --include.

--man Display the full documentation, using default pager.

Takes any databases specified with --fingerprints and merges them into a new
database called FILE. Conflicting fingerprints for an image will cause one of two
actions to occur:

1. If the image does not exist, then the entry is elided.

2. If the image does exist, then the old information is ignored and a new
fingerprint is generated from scratch.

By default, image existence is not checked unless there is a conflict. To force
removal of defunct data, use --prune as well.

A list of image files is not required if this option is used. However, if a list
is provided, fingerprint data for the files will be copied or (re)generated as

When --merge is used, the original fingerprint databases are not modified, even if
--prune is used.

See also: --rescan

-n, --no-compare
Don't look for duplicates.

-p, --program=PROGRAM
Launch PROGRAM (in foreground) to view each set of dupes.

PROGRAM must be the full path to an existing executable file. For more
flexibility, see the --include and --include-file options.

See also: --script

--prune Remove fingerprint data for images that do not exist any more. Has no effect
unless --fingerprints or --merge is also used.

Databases specified by --fingerprints are only modified if --merge is not used.

-q, --quiet
This option may be given multiple times.

Usually, progress, warning and error messages are printed on stderr. If this
option is given, warnings are not displayed. If it is given twice or more, errors
are not displayed either.

Information requested with --verbosity is still displayed.

-R, --recurse
Use --recurse to search recursively for images inside subdirectories. For
historical reasons, the default is to not do so. To avoid looping, symbolic links
to directories are never followed.

-r, --rescan
(Re)generate all fingerprints, not just any that are unknown.

If used with --add, only the fingerprints of files specified on the commandline
are (re)generated.

Implies --prune.

-s, --script=FILE
When used with --program, PROGRAM is not launched immediately. Instead
sh(1)-style commands are saved to FILE. This script may be edited (if desired)
and then executed manually.

When used without --program, two skeletal shell functions are generated: "VIEW"
simply echo(1)s its arguments; the empty function "END" runs after files-
processing is finished.

To display to terminal (or feed into a pipe), use "-" as FILE.

If --script is not given, the script is still created in memory and is executed
immediately. So, with the default VIEW and END functions, lines containing sets of
duplicates are displayed. See: EXAMPLES

See also: --include, --include-file

-t, --threshold=AMOUNT
Use AMOUNT as threshold of similarity. Append "%" to give a percentage or "b" for
bits. For backwards compatibility, a number with no unit is treated as a
percentage. Percentage is the minimum required for a match; bits is the maximum
that may differ: bits=floor(2.56(100-percent))

A fractional part may be given but it is only accurate to 100/256 (0.390625) for
percentage and it is meaningless for "bits". Default is "90%" ("25b") if not

-v, --verbosity=LIST
Enable display of informational messages to stdout, where LIST is a comma-
delimited list of:

md5 Display the checksum for each file, as per md5sum(1).

fingerprint | fp
Display the base64-encoded fingerprint of each file.

Alternatively, --verbosity may be given multiple times, and accumulates. Note
that this may not be sensible. For example, to be useful, md5 output probably
should not be merged with fingerprint data.


findimagedupes compares a list of files for visual similarity.

To calculate an image fingerprint:
1) Read image.
2) Resample to 160x160 to standardize size.
3) Grayscale by reducing saturation.
4) Blur a lot to get rid of noise.
5) Normalize to spread out intensity as much as possible.
6) Equalize to make image as contrasty as possible.
7) Resample again down to 16x16.
8) Reduce to 1bpp.
9) The fingerprint is this raw image data.

To compare two images for similarity:
1) Take fingerprint pairs and xor them.
2) Compute the percentage of 1 bits in the result.
3) If percentage exceeds threshold, declare files to be similar.


0 Success.

1 Usage information was requested (--help or --man), or there were warnings.

2 Invalid options or arguments were provided.

3 Runtime error.

Any other return values indicate an internal error of some sort.


To be written.


findimagedupes -R -- .
Look for and compare images in all subdirectories of the current directory.

find -type f . -print0 | findimagedupes -0 -- -
Same as above.

findimagedupes -i 'echo "# sort: manual"' -i 'VIEW(){ for f in "$@";do echo
\"file://$f\";done }' -- *.jpg > dupes.gqv
Use script hooks to produce collection-style output suitable for use with gthumb(1).

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