NAME

       recoverjpeg - recover jpeg pictures from a filesystem image

SYNOPSIS

       recoverjpeg [options] device

DESCRIPTION

       Recoverjpeg  tries  to  identify  jpeg  pictures from a filesystem image.  To achieve this
       goal, it scans the filesystem image and looks for a jpeg structure at blocks  starting  at
       512 bytes boundaries.

       Salvaged  jpeg pictures are stored by default under the name imageXXXXX.jpg where XXXXX is
       a five digit number starting at zero.  If there are more than 100,000 recovered  pictures,
       recoverjpeg  will  start  using  six  figures  numbers and more as soon as needed, but the
       100,000 first ones will use a five figures number.  Options -f and -i  can  override  this
       behaviour.

       recoverjpeg  stores  the recovered pictures into the current directory.  If you want it to
       store them elsewhere, just go to the directory you want recoverjpeg  to  save  the  images
       into  (using  the cd command at the shell prompt) and start recoverjpeg from there, or use
       the -o option.

       Note that device is not necessarily a physical device.  It may also be a file containing a
       copy  of  the  faulty  device in order to reduce the actual processing time and the stress
       imposed to an already defective hardware.  dd(1) or ddrescue(1) may be used to create such
       a working copy.

OPTIONS

       -h     Display an help message.

       -b blocksize
              Set  the  size  of  blocks  in bytes.  On most file systems, setting it to 512 (the
              default) will work fine as any large file will be stored on 512  bytes  boundaries.
              Setting it to 1 maximize the chances of finding very small files if the filesystems
              aggregates them (UFS for example) at the expense of a much longer running time.

       -d formatstring
              Set the directory format string (printf-style, default: use the current directory).
              When  used, 0 will be used for the 100 first images, 1 for the 100 next images, and
              so on.  The goal of this option is to circumvent the directory size  limit  imposed
              by some file systems.

       -f formatstring
              Set  the  file  name format string (printf-style, default: “image%05d.jpg”).  It is
              used with the image index as an integer argument.

       -i integerindex
              Set the initial index value for image numbering (default: 0).

       -m maxsize
              Maximum size of extract jpeg files.  If a file would be larger  than  that,  it  is
              discarded.  The default is 6 MiB.

       -o directory
              Change  the  working  directory before restoring files.  Use this option to restore
              files into a directory with enough space instead of the  current  directory.   This
              option can be repeated.

       -q     Be quiet and do not display anything.

       -r readsize
              Set  the  readsize  in bytes.  By default, this is 128 MiB.  Using a large readsize
              reduces the number of system calls but consumes more  memory.   The  readsize  will
              automatically  be  adjusted  to  be a multiple of the system page size.  It must be
              greater than the maxsize parameter.

       -s cutoffsize
              Set the cutoff size in bytes.  Files smaller than that will be ignored.

       -S skipsize
              Set the number of bytes to skip at the beginning of the filesystem image.  This can
              be  used  to  resume an interrupted session, in conjunction with -i.  The number of
              bytes may be rounded down to be a multiple of  a  memory  page  size  in  order  to
              improve performances.

       -v     Be  verbose  and describes the process of jpeg identification.  By default, if this
              flag is not used, recoverjpeg will print a progress bar showing  how  much  it  has
              analyzed already and how many jpeg pictures have been recovered.

       -V     Display program version and exit.

       All the sizes may be suffixed by a k, m, g, or t letter to indicate KiB, MiB, GiB, or TiB.
       For example, 6m correspond to 6 MiB (6291456 bytes).

EXAMPLES

       Recover as many pictures as possible from the memory card located in /dev/sdc:

              recoverjpeg /dev/sdc

       Do the same thing but ignore files smaller than one megabyte:

              recoverjpeg -s 1m /dev/sdc

       Recover as many pictures as possible from a crashed ReiserFS file system (which  does  not
       necessarily store pictures at block boundaries) in /dev/sdb1:

              recoverjpeg -b 1 /dev/sdb1

       Do  the  same thing in a memory constrained environment where no more than 16MB of RAM can
       be used for the operation:

              recoverjpeg -b 1 -r 16m /dev/sdb1

COPYRIGHT

       Copyright (c) 2004-2016 Samuel Tardieu <sam@rfc1149.net>.  This is free software; see  the
       source  for  copying  conditions.   There  is NO warranty; not even for MERCHANTABILITY or
       FITNESS FOR A PARTICULAR PURPOSE.

       If recoverjpeg saves your day and you liked it, you  are  welcome  to  send  me  the  best
       rescued ones by email (please send only 800x600 versions of the pictures) and authorize me
       to put them online (indicate which contact information you want me to use for credits).

SEE ALSO

       recovermov(1) sort-pictures(1) remove-duplicates(1)

KNOWN BUGS

       Recoverjpeg does not include a complete jpeg parser.  You may need  to  use  sort-pictures
       afterwards  to identify bogus pictures.  Some pictures may be corrupted but have a correct
       structure; in this case, the image may be garbled.  There is no automated  way  to  detect
       those pictures with a 100% success rate.

AUTHORS

       Samuel Tardieu <sam@rfc1149.net>.