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    The description :x article / tutorial idea? -- rasptut articles and tutorials for the raspberry pi + menu home articles tutorials bookstore rpi links contact sitemap time-lapse photography: pi studio 16/02/2018 in: ar...

    This report updates in 15-Jun-2018

Created Date:29-Jun-2012
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x article / tutorial idea? -- rasptut articles and tutorials for the raspberry pi + menu home articles tutorials bookstore rpi links contact sitemap time-lapse photography: pi studio 16/02/2018 in: articles [article in beta v0.5] at the weekend i returned to bristol digimakers after missing events in 2017 due to badly timed holidays. i've written about digimakers numerous times before and am a huge supporter of this bristol university student-run tech event. every time i go i love discovering new, cool, interesting, practical, and not-so practical things one can do with computers. normally i take along a zumo robot along with various bits and pieces (typically a selection of raspberry pi hats ). it's time for something different, and hence i presented raspberry pi lightbox studio . this is an attempt to create a low-cost photo studio in the home / bedroom / kitchen for an all in price of under £100 (including pi and camera). i've been keen on trying time-lapse photography at the small or macro scale. an example: i have a tub of science putty which is fun for all of five minutes as one pulls it into shapes and then starts to watch it collapse back to its original tub-shaped state. i say "five minutes" because that is about the limit of my attention span as it is a rather slow process. enter time-lapse photography to the rescue. time-lapse photography is a way of compressing time: a long duration is viewed as a video in a shorter period which has the result of accelerating the rate of change in a scene. most of us have seen examples like this in films and on youtube . one way to think of this is the exact opposite of bullet time featured in the matrix, which is a pretty advanced technique that gives the appearance of slowing time (while introducing 3-dimensional camera movement). if bullet time (with the help of cgi) makes things appear to move s-l-o-w-l-y then time-lapse makes things move more quickly. ahah! i do not have to watch my science putty collapse in real-time. i can create a video that accelerates the process. to achieve the effect we take many individual photographs and then stitch them together into the video. normal videos usually run at around 24 frames per second. for comparison to watch ice melt i take one photo every 15 seconds (your setting may vary). it will therefore take 15 x 24 = 360 seconds (or 6 minutes) to take the 24 frames required for one second of footage. we are therefore accelerating time 360 times! ice will melt in front of our eyes. to create a time-lapse effect you need a way to reliably take multiple photographs. assuming you won't do this by hand (oh the boredom!) you need to be able to program your camera to do this process automatically either with an intervalometer or via the settings on some modern cameras. this is where the raspberry pi comes in. coupled to a pi camera (i'm using v2.1 but this will work with v1 as well) we have a very fine degree of control over the creative process of creating a time-lapse movie as the raspistill software features a time-lapse mode . assuming you have followed the software set-up in the above guide the following steps will take you through the process: select target and compose scene take sample photo re-adjust re-take sample photo and check all is well run raspistill to capture individual photos using the time-lapse option stitch the images together into a movie watch and enjoy. you may want to use a stand-in for your target when setting up. for example, for a time-lapse of an ice cube melting use a d6 dice as a temporary target (or a whisky stone ) and keep the ice in the freezer until needed. else, you will miss some of the action. to create a good time-lapse technique several challenges present themselves and each must be overcome. i* broadly split this into: subject lighting photographing stitching * - other issues do exist, but get these four sorted and you'll be a long way towards creating excellent time-lapse subject essentially, you have two choices: go big or go small. if big (e.g.: clouds) then you will have less control over lighting (see below) but can create amazing views of our planet. if small then you need to be aware of potential close-up focus issues as the pi camera struggles to focus below 20cm by default. this can be corrected but do read several sources of information on this first to avoid damaging the camera. youtube has a good video showing the process. for those not liking the combination of pliers + delicate camera adafruit have the answer . or, for your first attempts just don't worry about it (i didn't). does an ice cube melting need to be in perfect focus? i'll leave that to you to decide. you should position the pi camera with a good view of your subject, and take sample photographs to ensure all is well before starting the time-lapse process. it is essential that you do not nudge either camera or subject in any way during the image capture process or the effect will be ruined. motion time-lapse, where the camera rig is intentionally and automatically moved along a rail between frames is a whole subject in its own right, and with perfection can create some staggering results . lightning one of the banes of time-lapse photography is flicker. this is created when the lighting between each frame differs slightly and/or the camera changes its exposure. with the controls of an slr camera (such as the excellent nikon d7200 that i use when not pi'ing) the latter can be resolved by using manual exposure mode and white balance settings. there are several ways to adapt to changes in lighting. you could, for instance, embrace lighting changes in your project. time-laps of clouds during the day -> evening -> night often do this. alternatively for controlled indoor scenes (science putty) you can use a lightbox that provides a controlled, consistent lighting array (ideally one that minimises shadows). i am using a £12.99 bit of kit from puluz . this lightbox has two led strips top-front and top-back that provide even lighting, albeit do be aware of bright sunshine from the front as that can still change the light level. from puluz's promotional images such as that below you can see that an added benefit of this lightbox is that a circle can be removed from the top to take photos from above the subject. as a piece of kit it is actually a lot better than its meagre price tag would suggest. better light boxes are definitely available but at this price point it is worth giving it a go. the two led arrays with supplied cables (that each require plugging in - use two usb ports on your pi 3) are bright and provide even lighting throughout the box. photographing when your scene is set use the raspistill command to start taking photographs. now, go make a cup of tea (or several) as the process will take a long time. remember: we are accelerating time in video, not in reality (not even the raspberry pi can do that...yet.) ;) the guide on time-lapse photography from the raspberry pi foundation is very handy here. assuming you have updated your pi to the latest firmware and enabled the camera then the key commands to enter at the terminal prompt are a variant of: mkdir tlcd tlraspistill -t 30000 -tl 2000 -o image%04d.jpg first we need to make a directory (mkdir) in which to store our time-lapse photographs as the camera will create a lot, and hence create a bit of a mess in any folder you are currently in. we change directory (cd) to the tl folder (cd tl) and then run raspistill with parameters to output images: -t switch is the amount of time to run the time-lapse for. in this example 30000 miliseconds, which is 30 seconds. -tl is the frequency to take photographs, 2000 milliseconds being 2 seconds in this example. -o is the image name to save the file to disk with %04d being a numerical increment. the 4 means pad with up to four preceding zeros. this will create images numbered 0000, 0001, 0002, etc, i.e.: image0001.jpg, image0002.jpg, image0003.jpg etc. you sh

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Domain name:
rasptut.co.uk

Data validation:
Nominet was not able to match the registrant's name and/or address against a 3rd party source on 27-Nov-2017

Registrar:
20i Ltd [Tag = STACK]
URL: http://www.20i.com

Relevant dates:
Registered on: 29-Jun-2012
Expiry date: 29-Jun-2020
Last updated: 15-Apr-2018

Registration status:
Registered until expiry date.

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ns2.eco-dns.co.uk 146.148.28.88

WHOIS lookup made at 13:13:12 15-Jun-2018

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  ARGS rasptut.co.uk

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DOMAIN

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