Viewing profile — ProgramMax

You....are wonderful. Thank you.

Yes, lots. The big one is adoption. I love JPEG XL and hope it becomes more widely adopted. It is very scary to add a format to a browser because you can never remove it. Photoshop…

Our first goal is to see what we can get for "free" right now. Most of the time, people save a PNG which is pretty far from optimally compressed. Then they compare that to another …

PNG Fourth Edition, which we are working on now, is likely to add gain maps. However, gain maps are extra data. So there is a trade off. The reason gain maps didn't make it into Th…

Agreed that it gets confusing. That's a piece of why I'm unable to give you a solid answer. This isn't my area of expertise. Here is what I can tell you confidently: The original p…

IIRC (been a while), the reason was ICCv2/v4 still requires a gamma function. And PQ is not a gamma function. Maybe they can cover HLG, but if we want to represent any given HDR co…

Yeah. I mentioned this elsewhere but repeating here: I designed the article to be accessible and understandable for the average person. So I took some liberties like showing only H…

Right. Sorry, that was supposed to be a "yes, and..." to provide some additional context.

Yeah. We were able to get buy-in from some big players. We cannot contact every group, though. My hope is since big players have bought in, others will hear the message and update …

Strangely, I was familiar with AIFF and RIFF files but never made the connection that they're both IFF. I hadn't known about IFF before your post. Thank you :) W3C requires that we…

Sure! Chris Lilley--one of the original PNG co-authors--has a post with an example HDR image: https://svgees.us/blog/cICP.html It is about half way down, with the birthday cake. Ge…

I'm trying to follow your point. But...there are problems with your claims. Yes, EXR stores color-space differently than PNG. Because EXR doesn't store color space at all. In the f…

Author here. Hello everyone! Feel free to ask me anything. I'll go ahead and dispel some doubts I already see here: - It isn't really a "new format". It's an update to the existing…

PNG previously supported ICC v2. That was updated to ICC v4. However, neither of these are capable of HDR. Maybe iccMAX supports HDR. I'm not sure. In either case, that isn't what …

Even though I know about this, I still pronounce it as letters. :)

It is very backwards compatible. :) We worked hard to make sure it would be.

0xFF is 8-bit. PNG supports up to 16-bit. It always has. Plus, PNG now supports full HDR so the fireball won't look washed out. I think your experience is with some tool that made …

Everything new is optional. This is not a breaking change. Old PNGs and software continue to work just fine. And these new changes are backwards-compatible as much as they can be. …

16-bit, yes. Arbitrary channel count, no. However, HDR is more than just bitcount.

PNGs have supported transparency since day 1 :)

In general, I support the "follow the money" idea. But I don't think it applies here. I'm retired and making zero money here. (I'm actually losing money on it. Wish I had a company…

You are correct. I designed the article to be very approachable and understandable for the normal person. As such, I took some liberties like only showing HDR primaries and ignorin…

libpng updates are either already landed or nearly landed.

It is very backwards compatible. I'm not sure why you thought that. We jumped through quite a lot of hoops to make sure old software will be able to display new images. They simply…

New? Yes. Incompatible? No. We went to pretty extreme lengths to make sure old software worked with the new changes. Effectively, the limit will be the software, not the image. For…