I have been making Optimage which is currently the only tool that can automatically optimize images without ruining visual quality [1]. It is also the new state of the art in lossless PNG compression.
I have raised a number of issues [2] with this guide. It’s been over a year and they still have not been addressed [3].
Your benchmark is not a legitimate comparison because it does not compare files of equal size. See https://kornel.ski/en/faircomparison for an explanation of the problems with your methodology. The files your closed source tool generates in this benchmark are 56% larger than those created by ImageOptim! Have your program generate smaller files and then post the results.
And noticeably degraded if you compare those images with the originals. Optimage does apply chroma subsampling, the major winner here, when it makes sense.
My goal is automatic image optimization with predictable visual quality, i.e. images have to remain authentic to originals.
> your closed source tool
FYI, ImageOptim API is closed source and way more expensive if that was your point.
> Your benchmark is not a legitimate comparison
If you have a better one,
> then post the results
I did post mine. Just why are you taking them out of context and missing others, e.g. lossless compression results?