EXR Diff

This is a very simple tool to generate a Delta E 2000 image difference between two EXR files using D65 white achromatic reference illuminant (CIE 1931 2°).

It is meant to be compiled easily without any headache on any platform.

It is not meant to be fancy or bloated.

Warning! This tool does not currently support:

Custom chromaticities: chromaticities specified in the EXR header will be ignored. Rec 709 is assumed. If you're using any other colorspace, the resulting Delta E will not be correct.
Luminance chrominance images.

Compilation

Clone the repository:

git clone https://github.com/afichet/exr-diff.git
cd exr-diff

After cloning the repository, ensure you have the submodule:

git submodule update --init --recursive

Then, you're ready to compile

mkdir build
cd build
cmake ..
make

You then can execute the program placed in bin/:

./bin/diff-exr

Usage

Basic usage:

This compute the Delta E 2000 between two EXR image, with the scale maxing to 10, no exposure compensation.

diff-exr <exr_image_1> <exr_image_2> -o <image_diff_png>

Options

To see all available options, use -h without extra arguments.

License

This tool uses the following Open Source libraries:

TinyEXR https://github.com/syoyo/tinyexr
LodePNG https://lodev.org/lodepng/
TCLAP http://tclap.sourceforge.net/

It also uses the colormaps from https://bids.github.io/colormap/ by Nathaniel J. Smith, Stefan van der Walt, and (in the case of viridis) Eric Firing. These are licensed under CC0 license (http://creativecommons.org/publicdomain/zero/1.0/).

It is licensed under the 3-clause BSD license.