Resize Magic is an application that resizes images with a high quality algorithm, similar to the Lanczos algorithm used by other programs, with some modifications. It can be used to batch resize images, and preserves Exif data and ICC color profiles. A Photoshop plugin is also available as a commercial product.
pLoader is software dedicated to photo preparation and transfer to your Piwigo installation. You can select photos from your file browser. Automatic preparation includes resizing for Web display, thumbnail creation, and automatic rotation. You can fill in information such as name, author, or description, and create categories. You can transfer a photo selection to your remote Piwigo photo gallery. Your photos are visible on your gallery as soon as they are transferred.