Are there any Erlang packages for image manipulation?

zabrane · May 1, 2025, 9:07am

Hi All

I’m looking for an Erlang package or wrapper around a good/maintained image manipulation library.

Something similar to Elixir vips package.

Help appreciated.
Thanks

mworrell · May 1, 2025, 10:29am

In Zotonic we have an interface to the command line version of ImageMagick. Works well.

I guess it could be split off into a separate library, if demand is big enough.

github.com/zotonic/zotonic

apps/zotonic_core/src/support/z_media_preview.erl

master

%% @author Marc Worrell <marc@worrell.nl>
%% @copyright 2009-2024 Marc Worrell
%% @doc Make still previews of media, using image manipulation functions.  Resize, crop, grey, etc.
%% This uses the command line imagemagick tools for all image manipulation.
%% @end

%% Copyright 2009-2024 Marc Worrell
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.

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There are more z_media_....erl files there, for identifying file, extracting mime type and size, etc. We also have some code for determining the focus point or images (useful when cropping).