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MozJPEG Support

By default, imagor uses libjpeg-turbo for JPEG encoding, which provides fast compression. For enhanced JPEG compression at the cost of slower encoding speed, imagor provides a MozJPEG-enabled variant that includes MozJPEG support through libvips.

MozJPEG improves JPEG compression efficiency while maintaining compatibility with existing JPEG decoders. It can reduce JPEG file sizes up to 30% compared to libjpeg-turbo while maintaining the same visual quality, but with slower encoding performance.

Docker build imagor-mozjpeg​

docker pull ghcr.io/cshum/imagor-mozjpeg

Usage:

docker run -p 8000:8000 ghcr.io/cshum/imagor-mozjpeg -imagor-unsafe -vips-mozjpeg

Enabling MozJPEG​

MozJPEG can be enabled using the -vips-mozjpeg command-line argument, or the equivalent environment variable:

VIPS_MOZJPEG=1

Docker Compose example:

version: "3"
services:
  imagor:
    image: ghcr.io/cshum/imagor-mozjpeg:latest
    environment:
      PORT: 8000
      IMAGOR_UNSAFE: 1
      VIPS_MOZJPEG: 1  # Enable MozJPEG compression
    ports:
      - "8000:8000"

When enabled, MozJPEG will be used for JPEG output, providing better compression efficiency for JPEG images.