“And others” in the title does not include HEIC: “HEIC is being excluded because it sucks”.
They also mention it’s not free. That would be ok. Just say your test is image quality of free image formats.
But that statement just undermined the trust I had in the author up to that point.
I should include that under "Takeaway," I do say that " ... this is a non-scientific test," & it shouldn't be considered objective despite the use of metrics. While I find SSIMULACRA2 correlates very well with what my eyes see with these images & most other images, 27 landscape/architecture images aren't enough to draw any objective conclusions here & I'd need to do more testing in the future to produce research-quality work.
I appreciate what you did. Your article is far above a simple “I looked at five pictures and decided this one was the best“ kind of comparison that you sometimes see. You clearly tried to do a good and fair job with your contenders.
The results were interesting to see. This isn’t an area I spent time in so I really didn’t know what to expect going in other than thinking there must be something better than the venerable JPEG.