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L'aventure de la reconstitution
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CONFÉRENCE
MAISON MINATEC
SA 10 OCT 10h30
Dans le cadre du salon Arts Sciences Technologies EXPERIMENTA 2015
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Gratuit
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Durée 2h
© Perzaio engineering
Découverte en 1994, la grotte Chauvet qui date de 36 000 ans, n’a jamais été ouverte au public dans un souci de préservation. Il était donc nécessaire de reproduire ce joyau
de l’humanité pour pouvoir le faire découvrir, et faire vivre au public les conditions réelles de la grotte (température, humidité, sensations, etc.), mais aussi pour faire découvrir
les mille dessins tracés sur les parois. Cette reconstitution portée par la Région Rhône-Alpes et le Département de l’Ardèche avec un soutien fort de l’État et de l’Europe a été rendue possible par l’alliance fructueuse de l’art, des sciences et des technologies.
Cette conférence invite différents protagonistes du projet, isérois notamment, à retracer l’épopée de cette reconstitution : Richard Buffat, directeur du Syndicat mixte de la Caverne du Pont d’Arc qui a porté l’opération, le cabinet Perazio, le scénographe Frédéric Ravatin et l’entreprise Campenon–Bernard. Elle mettra en lumière les prouesses
artistiques et techniques réalisées pour ce projet, du travail de relevé numérique opéré par le cabinet Perazio, dont la
technicité est à ce jour unique en Europe, à la création d’un clone numérique de la grotte utilisable par l’ensemble des corps de métiers (scénographes, spéléologues, architectes, BTP, peintres, artisans, éclairagistes…), jusqu’à la conception à l’identique, en taille réduite, de l’intérieur de la grotte.
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Retrouvez dans EXPERIMENTA un dispositif immersif qui invite le public à un voyage à travers le processus de reconstitution permettant de rendre visible un pan entier de l’histoire de l’Homme.
This is not supposed to be Great Art, it is just a home experiment with candlelight, and more specifically, simulating and enhancing candlelight.
I have a volunteer photo-shoot commission tomorrow at a local county historical site. They do this every year, and it is a “Candlelight Tour” of a local 18th century mansion. I think that this shot is actually getting close to what I have in mind, so I’ll describe what I did – for my own future reference, of course.
First, understand that I have a real hard time trusting automatic settings. I feel that way about cars, and I feel that way about photography too. I want to be in control of everything myself, this way, if I decide on the spur-of-the-moment to change something, I know what all the various vectors are set to and what changing one or another will do.
I plan to use flash as my primary light source, because on the one-hand it may be dark in this place with only candles, and on the other hand I may need to suppress the ambient light coming in from outside, which could be considerable if it is a sunny afternoon tomorrow. It is overcast today, but I have a large expanse of windows to camera-left.
I set the camera to a fixed-ISO of 1600 (versus my usual variable ISO) because that is the highest sensitivity that I’m comfortable with for decently clean output, and I don't want the camera overriding me. What can I say; I’m picky.
I set the Tv to 1/200 because I want to suppress as much ambient light as I can. If I want to suppress more ambient once I am on-site, I’ll drop the ISO. The ETTL flash will automatically compensate for foreground Ev, and the ambient will fade-to-black.
I set the Av to f4 because I want some bokeh on the background for separation, but f4 is a little more tolerant of DoF than f2.8.
I also put a “gel” on the flash to alter its color. What I have is a set of small transparent-plastic rectangles of various colors sold for just this purpose. They simply fit on the flash-lens, and I secure it with scotch-tape. What I’m using here is a specific color-filter known as “1/2-CTO” (Color Temperature Orange) this turns the flash light from “blue” to a medium “orange” color (for reference, 1/4-CTO is traditional for matching flash to incandescent light bulbs). My goal is to have the light coming from the flash roughly approximate the color of flame, which is rather orange, after all. I want the scene to be a LITTLE orange, but not TOO much.
I set the camera metering-style to center-weighted, and the flash is set for ETTL (the one-and-only “auto” variable here) and the flash output is set for -1Ev. I am underexposing a bit because this is supposed to be candlelight, and anything too bright would give-it-away. I am also using one of those hard-plastic caps on the flash (the gel is underneath this). I have one of those ubiquitous Gary Fong bulb-looking-things, but I want this light to be more directional than that so that it could be a fireplace or candelabra. On the shoot tomorrow I may hand-hold the flash away from the camera (low-and-away, I think), but this was done with a tripod and RF-trigger.
The final question is; what about White Balance? I suppose that I could have used AWB, but then you get-what-you-get. I could also use something like "daylight" or "shade", but again, those are very coarse adjustments and to adjust the color I’d have to mess around with the gels. That would be awkward and time-consuming, and I only have 4 or 5 different “orange” gels. What I did instead was use a fixed “Degrees-Kelvin” setting as WB. The color of the light is the color of the light, but this way I can fine-tune the exact color that the camera “sees” and records relative to the ½-CTO gel. The default color-temp of flash (and AWB) is 5500-K. When I tried 6500-K it was VERY orange, and when I stepped down to 4000-K it was a little too blue, so this is set to 4500-K, and I think that the effect is pretty-much what I want. If I have to, I can tweak the WB in processing, but that hasn’t been done here, following the Less-Is-More principle.
So – this is what I’ll go to the shoot with tomorrow. If the ambient is too bright (and/or blue) I’ll drop the ISO (which is a Good-Thing anyway), and I am prepared to modify the flash output also (now at -1Ev) to adjust flash output.
5D4-01925-20191214
I love my hotpoint microwave
after some recent home remodeling by my parents they removed the large mirror from the hall, so now there were no large reflective objects downstairs. Until the new kitchen was fitted where now the micro/oven tower combo also doubles as a full lenght mirror
sad i know but we make do with the best that we can
Experimenting applying textures to objects in 3DS Max. Textures used are galvanised steel, fibreglass and wood. All textures retrieved from www.cgtextures.com
Blumen können nicht weglaufen und sind daher gut geeignet die eine oder andere Kameraeinstellung auszuprobieren (Kombination relativ lange Brennweite mit offener Blende).
This is a SINGLE SHOT PHOTO. Last night I was playing around with idea to create a multi picture with one single long exposition. In this case I manualy fired a flash in my hand 3 times while moving infront of the objectiv. Also the fact that I was lucky to shoot the face in the middle extremly sharp brings up a lot of other ideas how to get advatage of this technique :-) Just need to reserve some time for that... however I'm looking forward to your experiments!
ISO 100, Exposure time: 6 seconds, F: 5, Focal lenght: 41mm (x1,6 for Canon 400D) Speedlite430
AEL - Locked AE
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Automatic Exposure Lock (AEL), the metering mode is in fact
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set : by custom buttons
The spherical phantom is made of tissue-equivalent substance (judging by a colour it’s a meat equivalent). It contains a number of dosimeters which are placed at different depths, that corresponds to different tissues, e.g. 3mm depth corresponds to a crystalline lens, and 70mm - a central nervous system.
Nadat mij verteld was dat je het best met wat zoom een panorama foto kunt maken, heb ik het op de bank uitgeprobeerd...