Duplicate image finder in Elixir
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Duplicate image finder

This application will search a folder and its sub-folders for duplicate files and move them to a specified location. Only files within the same folder are considered duplicates!

Build the application


Install Elixir.

You need the tool Compare from ImageMagick. If you are on OS X and have got brew installed, you can install it with:

brew install imagemagick

Compile the application to a binary

mix escript.build

This will create a binary called "duplicate_image" which you can run on all systems which has the Erlang-runtime installed.

Launch the application

./duplicate_iamge /path/to/gallery /path/where/to/store/duplicates 0.1

The threshold, 0.1 in the example, must be a floating-poing number. 0.0 is a perfect match and 1.0 is entirely different. Perfect matches will always be moved!


The metric used is "RMSE". The comparison is very slow and CPU-demanding which motivates parallelisation. The number of concurrent Elixir processes will be determined by the Erlang setting "schedulers_online" which normally amounts to the number of CPU-cores (or CPU-cures * 2 if hyper-threading is used).


This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.