dbuenzli / pixeldrift

Find perceptible pixel differences with OCaml (unreleased)

pixeldrift — Find perceptible pixel differences with OCaml

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Pixeldrift is an OCaml module to find perceptible pixel differences between two equally sized sRGB images with an alpha component. It is mostly suitable for comparing synthetic images: diagrams, user interface screenshots, rendering algorithms outputs, etc.

Pixeldrift has no dependencies. It is distributed under the ISC license. The command line tool depends on cmdliner.

Installation

Pixeldrift can be installed with opam:

opam install pixeldrift
opam install cmdliner pixeldrift  # For the command line tool

If you don't use opam consult the opam file for build instructions.

Documentation

The documentation can be consulted online or via odig doc pixeldrift.

Questions are welcome but better asked on the OCaml forum than on the issue tracker.

For the command line tool consult pixeldrift --help.

Acknowledgments

• Pixeldrift is based on the JavaScript pixelmatch library. See the module documentation for more information.
• The perceptual color metric is defined in Kotsareno et al. Measuring perceived color difference using YIQ NTSC transmission color space in mobile applications. 2010.
• The vendored C PNG codec used by the command line tool is courtesy of LodePNG.