Cantaloupe vs Converseen

Cantaloupe is a free, open-source, self-hosted image server that creates derivatives from high-resolution sources when requested. It can crop, scale, and rotate images for deep-zoom viewers and on-demand thumbnails, and conforms to every IIIF Image API version through 3.0. Sources may be filesystems, HTTP or HTTPS servers, S3, Azure Storage, or relational database BLOBs. Processing choices include Java 2D, JAI, TurboJPEG, Kakadu, OpenJPEG, Grok, FFmpeg, and PDFBox. Caches can use filesystem, Java heap, JDBC, S3, Azure Storage, or Redis implementations. Security options include selective image and text watermarking, image-region redaction, HTTPS, HTTP Basic authentication, and customizable authorization policies. Configuration uses environment variables or a .properties file, with most changes applying without restart. Java 17 is required at minimum. The project says no official Docker image is currently available.

Converseen is a free batch image processor for Windows, Linux, macOS, FreeBSD and other operating systems. It converts, resizes, rotates, flips and compresses images, and renames groups using progressive numbers or prefix and suffix values. Through ImageMagick, it handles more than 100 formats, including DPX, EXR, GIF, JPEG, JPEG-2000, PNG, SVG, TIFF, WebP and HEIC/HEIF. It can turn a full PDF or selected pages into images with chosen dimensions and formats, and extract images from Windows icon files. Converseen is built with open-source frameworks and libraries including Qt and ImageMagick; its source is released under GNU GPL version 3. Linux installation options include source code, AppImage, Snap, Flatpak and distribution repositories. The program does not transfer information to other networked systems. The Free plan is free. Windows and Linux users need Ghostscript configured for PDF processing, and the macOS release is beta and not currently codesigned.