Check for (dis)similarity between two or more PNG images.
This tool computes (dis)similarity between two or more PNG images using an algorithm approximating human vision.
Comparison is done using a variant of the SSIM algorithm at multiple weighed resolutions.
The value returned is 1/SSIM-1, where 0 means identical image, and >0 (unbounded) is amount of difference.
Values are not directly comparable with other tools, but DSSIM is generally more accurate (according to TID2013 test suite).
For versions of Ubuntu between 14.04 LTS (Trusty Tahr) and 15.10 (Wily Werewolf), as well as Ubuntu flavours that don’t include snap by default, snap can be installed from the Ubuntu Software Centre by searching for snapd.
Alternatively, snapd can be installed from the command line:
sudo apt update
sudo apt install snapd
Either log out and back in again, or restart your system, to ensure snap’s paths are updated correctly.
To install DSSIM, simply use the following command: