jpeg-archive 2.2.0

This release includes the following fixes and new features:

• Support for GNU Parallel as an alternative to Ladon.
• Fixes to the PPM parser; PPMs generated by libvips are now parsed gracefully.
• The minimum quality is ensured to always be smaller than maximum quality.
• Various internal changes to make the jpeg-archive utilities more robust.
• Several fixes to the Makefile, as well as FreeBSD support.

JPEG-Archive 2.1.1

This release fixes an issue on Windows and adds a quiet mode.

• Fix input/output using stdin/stdout on Windows by setting the stream to binary mode.
• Add a --quiet option to turn off non-error output.

JPEG-Archive 2.1.0

This release adds the ability to disable subsampling and updates the underlying mozjpeg library.

• Add the --subsample parameter which can be used with the value disable to turn off subsampling. By default 4:2:0 mode is used (which subsamples chroma channels 2x1). Disabling it turns on 4:4:4 mode which may be desired for certain use-cases but is generally not required.
• Update to the official mozjpeg 3.0 release. This provides an extra 1-2% compression advantage at the same encoding quality and speed.
• Set up Windows CI so that Windows users can always grab the latest binary from the Windows CI build server

JPEG-Archive 2.0.1

This patch release updates to upstream releases, introduces some speed improvements and contains a handful of minor fixes to tests and documentation.

• Update to latest mozjpeg
• Speed up --accurate mode
• make install now installs jpeg-archive script
• Run real-world file tests by default
• Fix several compiler warnings

JPEG Archive 2.0.0

This release changes the underlying JPEG encoding library to mozjpeg and defaults to progressive encoding. On average, the output of jpeg-recompress is now around 5-10% smaller, but the exact amount will vary based on input images. Also included are new metrics and input options.

• Add jpeg-archive bash script to help automate archiving images
• Switch to mozjpeg
  • Output is now progressive by default
• Add SmallFry metric (similar to JPEGMini)
• Add MPE (mean pixel error) metric (similar to imgmin)
• By default, copy files that will not be compressed (disable with --no-copy)
• Add support for PPM input in jpeg-compare to compare PPM with JPEG
• Documentation updates

JPEG Archive 1.1.0

Fixed a bug related to reading from STDIN and added the ability to send PPM image data (instead of JPEG input) to jpeg-recompress using the --ppm option. This makes jpeg-recompress a replacement for cjpeg for creating JPEG files at a certain perceived quality. Example using ImageMagick's convert utility:

$ convert myinput.tiff ppm:- | jpeg-recompress --ppm - output.jpg

JPEG Archive 1.0.1

Fixes a bug related to grayscale image conversion used during SSIM calculations.

JPEG Archive 1.0

Initial release.