lcrs

10 ms·

31.
by lcrs 12y ago
It's not great but it is slowly getting better as the big studios open-source their inhouse formats - Disney, Sony Imageworks and ILM are all doing so and Alembic, OpenVDB, OpenSubdiv, OpenEXR, and Ptex are all widely supported now. T
32.
by lcrs 12y ago
There's documentation of a method to achieve the same thing using free-ish software here: http://wedidstuff.heavyimage.com/index.php/2013/07/12/open-s... Principally it uses VisualSFM and Meshlab, b
33.
by lcrs 12y ago
A couple of years ago I got really interested in the shape of cooling towers after hanging out inside a couple of derelict ones. I couldn't find a solid answer as to why they are hyperboloids, and in fact not all of them are, but the
34.
by lcrs 12y ago
I think what one might crudely call the "audiophile phase beef" is not about the comb-filtering that results from misalignment but the non-linear phase response of most crossovers, before the signal hits the air. Most act somewha
35.
by lcrs 12y ago
Even cameras which vary speed during an unbroken shot automatically compensate so the exposure stays the same, but doing so has other interesting effects, depending how it's done: a) Compensating with shutter so that the integration ti
36.
by lcrs 12y ago
I've heard two explanations for this. The first is that the longer wavelength "red"-ish receptors in our eyes are also excited by the frequencies of light at the other end of the visible spectrum, so shorter wavelengths than
37.
by lcrs 12y ago
It does seem a bit funny to do it in two stages but it's the standard way... it might seem more natural if you were to do the resampling stage first - resample by a factor of 2x and you have the same sound but an octave lower and twice
38.
by lcrs 12y ago
You can absolutely tell a difference! Probably more so with synthesized sounds, which don't have natural pitch deviations or complex harmonics. The beating you hear in any even-tempered dyad other than an octave is really obvious wit
39.
by lcrs 12y ago
e2 is fairly deranged. It's not your place to head for an informative read, and "encyclopedia" would definitely not be the right word, but it's great for ideas, stimulation, not-quite-sure-if-satire, unfinished short fi
40.
by lcrs 12y ago
At 25fps and 48Khz you rather neatly have 1920 samples per frame, which is coincidentally the width of an HD picture. At least I think it's a kind of a coincidence... I believe the number 1920 was derived from the 720 horizontal pixel
41.
by lcrs 12y ago
Had many terabytes of footage shot of events that couldn't be recreated with cameras that turned out to have broken firmware. When reading out the sensor the ADC would get out of sync with the shift register, resulting in adjacent pix
42.
by lcrs 13y ago
Those SIGGRAPH talks, OCIO and Jeremy Selan's http://cinematiccolor.com have been a touchstone a while :) Thank you so much for the filmicgames link, that's exactly what I was curious about. In return maybe I can offe
43.
by lcrs 13y ago
The page header mentions "filmic tonemapping", I'd love to hear what that entailed in this case - is it a post-render 3D LUT as some games now do? I couldn't see anything from reading the source... I'm really inter
44.
by lcrs 13y ago
Raytracing may be conceptually the most natural but it's not always the best choice for a lot of these cases - displacement, motion blur, depth of field and anti-aliasing are still often handled much more quickly by micropolygon/s
45.
by lcrs 13y ago
There's another great application of spherical harmonics in (non-real-time) lighting, used by Weta for Avatar. Instead of precomputing the terms for a particular lighting setup as above, they use SH to store an environment map for eve
46.
by lcrs 13y ago
The mapping is not one-to-one though - for example when S is 0, all values of H give the same resulting colour, and worse when V is zero both H and S are useless. So an image exploring the full HSV space should look different, probably wit
47.
by lcrs 13y ago
I worked on the post-production of Moon, particularly the titles and the screens in the base and Gerty's face. Pretty humbling to have someone pay so much attention to what we did! It's funny to hear about the Microstile/Eur
48.
by lcrs 13y ago
I remember hearing at the time that the reason they were able to build such a big set for the moon base was because the stages were mostly empty, also due to the writers' strike.
49.
by lcrs 13y ago
I was always taught the opposite rule for PA amps - they should be rated higher than the speakers, as per http://books.google.co.uk/books?id=dWILAAAAQBAJ&pg=PA118&dq=... , http://www.sweetwater.com/in
50.
by lcrs 13y ago
I recently came across similar behaviour in Linux - if you are waiting in XNextEvent on one thread and you call glXSwapBuffers on another, it never returns. If you move the mouse, XNextEvent returns with a MotionNotify event and glXSwapBuf
51.
by lcrs 13y ago
No display of any kind meets the Rec. 2020 gamut spec. It's more a future proofing step than a realistic target. The fact that the primaries are sat right on the single-wavelength line indicates an eye towards future laser projectors
52.
by lcrs 13y ago
These actually increase the apparent contrast you see on the screen. They're especially helpful for LCD panels which have washed-out and uneven black which is very noticeable in a dark room. Having the colours match the picture see
53.
by lcrs 13y ago
I do this a lot, on machines which are annoyingly vendor-tweaked to allow a lot of dirty pages. Copying files to USB sticks happens instantly, but the unmount then takes an age - like, 20 minutes. This is a way to get a measure of the pro
54.
by lcrs 13y ago
I've used a triangular ("conical"?) kernel when in a hurry and it looked reasonable. Vastly better than a box blur, at least. They're actually not separable but one can pretend and just do horizontal and vertical passe
55.
by lcrs 13y ago
Last I played with FFT convolution it didn't end up being a win for any sane filter size, even compared to brute-force convolution with arbitrary non-separable kernels. Admittedly I was using off-the-shelf tools in Nuke, but I would i
56.
by lcrs 13y ago
They make 2k and 4k chips, but only for their licensees I believe, not the public: http://www.dlp.com/technology/dlp-press-releases/press-relea...
57.
by lcrs 13y ago
I think the bits of negativity are more about their methods than their products. There aren't many people who find much to fault in the actual cameras, but the way they are marketed and supported is maddening to people used to deali
58.
by lcrs 13y ago
Geoff Boyle is probably more a commercials DoP than a feature film one, but in this context he is notable for running the CML mailing list, which is a pretty incredible resource for cinematographers. I think it's the most focussed, kn
59.
by lcrs 13y ago
I'm not sure the Alexa and F35 were panicked responses to the Red... the Arri D20 and Panavision Genesis predated the Red, and are very clearly the ancestors of the Alexa and F35 respectively - they use the same resolutions, sensor lay
60.
by lcrs 13y ago
Re video's "studio swing" dynamic range, the YUV components do have a different encoding range to those in JPEG, but if you expand them back out to 0-255 the image is in fact the same - you lose a lil' fraction of your b

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