Install
Works with Drupal: 7.xUsing Composer to manage Drupal site dependencies
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Release notes
1) Fixed bug related to images with uppercase extensions;
2) Added ability to add watermarks to already uploaded files;
3) Created update hook to resave gif and jpeg, jpg files which was watermarked and saved as png;
4) Deleted dependency on media and file_entity modules;
5) Used batch operations to add watermarks on page http://yoursite.com/admin/config/media/watermark/batch;
Please be careful with this release (do not use it in production without previous testing on local or dev environments) it is just first one and I am waiting for feedback and possible bugs to fix them. But at all for me batch watremarking works well.
Thank you for using media_watermark.