lcrs

6 ms·

1.
by lcrs 1y ago
There are a few projects now that simulate defocus properly to match what bigger (non-phone camera) lenses do - I hope to get back to working on it this summer but you can see some examples here: https://x.com/dearlensform
2.
by lcrs 2y ago
If you're interested in the equivalent of "backprop through zemax" there are a few projects going on to jointly optimize optical designs with the image processing, e.g. check out: https://vccimaging.org/Public
3.
by lcrs 2y ago
I've been working on something similar, although I'm more interested in replicating the effects of existing lenses than designing new ones: https://x.com/dearlensform/status/1858229457430962318 PBRT 3rd
4.
by lcrs 2y ago
Colour in the Photoshop/gamedev world is often handled pretty casually, but if you're interested the moving picture world gets a lot more rigorous about it and there's tons of documentation around the ACES system in particula
5.
by lcrs 7y ago
I've worked on a few bloody moments in film VFX and we certainly looked at some horrible reference of wounds, including headshots from pathology reports. I don't think I suffered much beyond the odd sigh but it was only for a cou
6.
by lcrs 7y ago
A lot of that group's publications are listed here, many involving optical flow: http://web.archive.org/web/20161014025823/http://gpu4vision.... Maybe this one from 2007: https://www-pequ
7.
by lcrs 8y ago
I'm actually not sure much ML was involved here - depends where you draw the line I guess, but denoising and interpolation for restoration typically use more traditional wavelet and optical flow algorithms. The work for this was done
8.
by lcrs 9y ago
Perceptual uniformity is in some ways opposite to the linearization suggested above - the L* component of CIELAB is much more like the gamma-encoded values of sRGB than a linear light measure. It seems tough to come up with hard and fast ru
9.
by lcrs 9y ago
Digital cinema uses wavelet compression - intra-frame only JPEG2000 at hundreds of Mbps. It seems that at high resolution and bitrate it actually performs similarly to or better than h264, e.g. this paper and its references: http:/&#
10.
by lcrs 9y ago
That's exactly how it's normally done - the offline editor works with low bitrate HD files, then gives the edit list to the online team who re-conform from the full resolution stuff. There's always an impetus to get higher re
11.
by lcrs 9y ago
Shamefully I can't remember which wahwah I used - I was treating the audio with both Audacity and Pro Tools as well as sox though...
12.
by lcrs 9y ago
Similar results - converting to a square image at 8bit then lowering JPEG quality just gets noisy in an uninteresting way: sox mo.wav -e unsigned -b 8 -c 1 -r 48k mo.raw bytes=`stat -f %z mo.raw` width=`echo sqrt$$bytes$ | b
13.
by lcrs 9y ago
Nice script :) I did a similar thing by hand with graphicsmagick and sox a couple years ago - the most fun result was from wahwah, pretty much a wide bandpass filter with centre frequency varying cyclically over time: http://lew
14.
by lcrs 10y ago
Strikingly similar to the low-discrepancy sequences used as sampling patterns in modern ray tracers - and quite a similar role, really: https://en.wikipedia.org/wiki/Halton_sequence https://books.google.co.u
15.
by lcrs 10y ago
The IE11 result makes me weep here, given the popularity of it - thanks for doing these tests. The amount of work we put into maintaining correct colour through the production chain seems increasingly wasted... FYI I tested Safari 9.1.1 (1
16.
by lcrs 10y ago
Correct! But for wider gamuts (and higher-contrast displays), the benefit becomes more obvious in the lack of banding.
17.
by lcrs 10y ago
This is kinda happening - the "UHD Alliance Premium Certified" spec for TVs mandates 10-bit from the input to the panel. It's a shame the UHD Blu-ray standard doesn't mandate 10-bit, thought hopefully most will use it :)
18.
by lcrs 10y ago
The antialiasing linear vs. gamma debate is an interesting one - check out this conversation, wherein nobody could figure out a reasoned method other than "sometimes AA in sRGB looks good"... https://twitter.com/ry
19.
by lcrs 10y ago
10-bit with a log or gamma encoding is widespread in film and video work, and I've never known a banding problem, even with purely generated gradients. The Rec. 2020 UHD standard does recommend 12-bit gamma-encoded to deal with the lu
20.
by lcrs 10y ago
Shake is more complete than Natron still - and some parts of Shake are still world class, the spline-based warping for example is still on par with Nuke and Flame, and the included versions of Keylight and Primatte haven't been hugely
21.
by lcrs 10y ago
I was always curious how much use that Spirit support saw - it must have been a ton of work, but it seemed like it was added just at the precise moment when everyone switched from running the film in real time during a session to scanning t
22.
by lcrs 10y ago
I occasionally see Spirit 2k's destined for the dump and wonder what would be entailed in running one. Since they were a little notorious for poor frame-to-frame registration I wonder if that will get worse as the mechanics age. It&#x
23.
by lcrs 11y ago
I'm interested to know how they're interfacing with the Adobe apps. I hooked up trackballs to Levels in Photoshop using the official "Connection SDK" a couple of years ago and the latency felt terrible, as far as I coul
24.
by lcrs 11y ago
With modern film stocks and scanners Super8 can look remarkably good. It'll be interesting to see how Kodak's scanning service compares to scans like these, both of which were shot with another new Super 8 camera, the Logmar Digi
25.
by lcrs 11y ago
I can't imagine btdigg can scrape the whole DHT, but I think the idea is that the traffic they see by running many "fake" nodes is proportional to the whole, because the DHT spreads all traffic around fairly equally? I'
26.
by lcrs 11y ago
Aha, the long .torrent file it drops matches the magnet link too. The MD5 of AF.dat from that page doesn't match what I've got but maybe it gets modified...
27.
by lcrs 11y ago
Interesting, whilst downloading the bittorrent client ID strings were all "LT/1.0.3.0", maybe a connection to the Lineage malware from that page?
28.
by lcrs 11y ago
For the curious, the magnet link is: magnet:?xt=urn:btih:a4a75d2e4095d457467777673e96cd331575b511&dn=AF file(1) has nothing to say about it but at a glance it doesn't look like a uniform encrypted blob...
29.
Why is the #2 torrent in DHT a 25Mb file named AF.dat?(btdigg.org)
40 points by lcrs 11y ago|18 comments
30.
by lcrs 11y ago
Nuke works in scanlines like this, and can process a whole tree of operations only loading the input lines necessary for the current output row. The SDK docs explain the architecture somewhat: https://www.thefoundry.co.uk/p

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