Felix Handte

🚀 Introducing OpenZL, a new #opensource, format-aware compression framework! It uses a unique “graph model” for compression, enabling modular, high-performance codecs and a universal decoder - perfect for structured data at scale Link: engineering.fb.com/2025/10/06/dev… #DataCompression

We are open-sourcing OpenZL, a new data compression library and training tools to generator specialized compressors for structured data, achieving performance levels inaccessible to classic generic algorithms: github.com/facebook/openzl

Can't cram in a movie on your busy schedule?? Settle in for an unsettling 45 minutes with CRAM! 😈 #CRAM is available today on @Tubi and more! TUBI: bit.ly/3sjnYwV

@absidell @coopercooperco E.g., the fix for this would be to slide the bottom left control point of the green channel curve to the right a bit.

@absidell @coopercooperco In response, my first adjustment in Lightroom is now always to adjust the channel scales myself to fix these mismatch errors, by manipulating the endpoints of the channel curves.

got some ektachrome back that has some shots with a green tint in the shadows that I’ve never experienced before. Is this from underexposure or what? It’s present seemingly at random and I don’t think I’ve ever seen a roll of my ektachrome do this. It shouldn’t be expired.

Wow if I had grades like this in school CRAM wouldn't exist

With 10 DAYS left to study like your life depends on it before CRAM drops on-demand & streaming, I’m excited to share more rad behind-the-scenes highlights🤘 And there’s nobody radder than one of the original Rad Rhinos himself: @felixhandte 🦏 — CRAM’s cinematographer! 🧵

@dhueuskndskjsm @danluu There were many hard parts.

@danluu The hard part here was done by Jarosław Duda who created ANS.

I wonder how much waste has been eliminated by Yann Collect creating zstd. When I ran the numbers at Twitter, which is tiny compared to the huge tech companies, switching to HDFS to zstd was ~ mid 8 figs/yr. Across the world (not annualized), it seems like must be >= 9 figs?

@mattroll_ Don't worry, C's got you covered: statically allocate all your memory.

@mattroll_ There is no god but the one true god, whose name is ISO C.

@steveyedlin Man, I’m sorry. I’m really trying to resist going further down the m.xkcd.com/386 rabbit-hole. But I think it comes down to this: I’m talking about cd/m^2 and you’re talking about lm/m^2. Energy (lm) = intensity (cd) * area (aperture).

@FelixHandte (No, it’s not a different thing. It’s exactly the same thing. The total energy over the whole surface area is the sum of the energies in all the subdivisions that you choose to break the the whole area into — whether those areas are photosite-size or not.)

Time for a new #NerdyFilmTechStuff post. This is the most esoteric and obscurely technical one yet, so it's only for those suffering from the most severe Nerdism. The topic is "Transmission And Aperture." yedlin.net/NerdyFilmTechS…

@steveyedlin At any rate, thanks for chatting! I've really enjoyed your work, both on screen and #NerdyFilmTechStuff.

@steveyedlin (Obviously the total energy incident on the film plane changes, but that's a different thing...)

@steveyedlin Is it that intensity (cd/m^2) matches between the object and the image? Or that total flux (lm/m^2) matches between the object and the image? Or something else?

@steveyedlin Fair. I tried! But it's not clear to me what the fundamental conclusion you're reaching is. Apparently, the statement I thought you were arguing for is one we both don't agree with. So what is true of shooting at t/1.0 that you're saying isn't true of other apertures?