HALIC is by far the best lossless codec in terms of speed/compression ratio. If lossy mode were similarly available, we might not be discussing all these issues. I think he stopped developing HALIC for a long time due to lack of interest.
Its developer is also developing HALAC (High Availability Lossless Audio Compression). He recently released the source code for the first version of HALAC. And I don't think anyone cared.
AVIF/AV1 is a codec that encodes both lossy and lossless files very slowly. JXL is significantly faster than AVIF. But AVIF provides better image quality than JXL even at lower settings. However, AV2 will require much more power and system resources for a small bandwidth gain.
If you are really going to do something new, I recommend that you proceed through a work that is very good at this. For example, HALIC(High Availability Lossless Image Compression). It is both extremely fast and has a very good compression ratio, and memory usage is very very low. There is also very strong Multithread support already. I think something like this would be great for the new PNG. Of course, we don't know what the author of HALIC thinks about this.
HALIC does almost the same degree of compression tens of times faster. And interestingly, it consumes almost no memory at all. Unfortunately, this is the case.
QOI is just a simple filter. It cannot do full compression. In fact, in certain cases it can increase the size instead of compressing. It is unnecessarily overrated, of course, mostly because it is open source. The rest is irrelevant. There are another codecs that is as fast as QOI (or even faster and multi-core) but with a much higher compression ratio.
QOI is just a simple filter. It cannot do full compression. In fact, in certain cases it can increase the size instead of compressing. It is unnecessarily overrated, of course, mostly because it is open source. The rest is irrelevant.
There is another codec that is as fast as QOI (or even faster and multi-core) but with a much higher compression ratio. HALIC (High Availability Lossless Image Compression). But because it's closed source, it definitely didn't get the attention and respect it should have gotten. And that's why I think it stopped developing.
Its developer is also developing HALAC (High Availability Lossless Audio Compression). He recently released the source code for the first version of HALAC. And I don't think anyone cared.