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Lighting series

So far in this series, I have stressed some of my own preferences for good portrait lighting; using Fresnel lamps for key lights to enable accurate barn dooring, minimum spill light and an even ‘field’ of light. Open faced lamps, whilst cheaper, do not give the same control of light, they give rise to double shadows and are also prone to bubble fai...

Submitted by Dennis Lennie

Published 01 October 2009

Ask the experts. Eye & Jitter

Why should TV broadcast engineers be interested in adding Eye and Jitter measurement to their T & M facilities?The call for Eye and Jitter as part of overall video test and measurement lies in the widespread adoption of serial digital interface (SDI) standards for broadcast. Unlike analog transmission in which the image quality gradually degrades a...

Submitted by Dennis Lennie

Published 01 September 2009

HD Camera Measurements. Getting the most out of your came...

Recap previous Parts:While the first parts covered the theory and actual measurements of white shading, setting up colorimetry, exposure, greyscale adjustments, alignment and matching of cameras using a waveform monitor, this final part is devoted to providing a better understanding of the displays used. Interpreting a waveform monitor displayA Wav...

Submitted by Dennis Lennie

Published 01 July 2009

NAB 2009 report

By general consensus, this year's NAB Spring Convention, or 'NABshow' as it styles itself, was one of the best ever. Wider aisles and a respectable rather than manic level of attendance made the event, in the words of one exhibitor, 'Business Class'. NAB was always the prototype show where you could sense the directions in which manufacturers were...

Submitted by Dennis Lennie

Published 01 July 2009

PHABRIX storming ahead at NAB with eye and jitter

It is not often that a product is released that encapsulates so distinctly the essence of British ingenuity but the new SxE hand held test and measurement instrument with eye and jitter functionality from PHABRIX may just have set itself in that mould. Having successfully launched the PHABRIX SxA, a three in one portable testing device at IBC2008,...

Submitted by Dennis Lennie

Published 01 June 2009

HD Camera Measurements and getting the most out of your c...

Recap Parts1 and 2:Parts 1 and 2 covered the theory and actual measurement of white shading, making sure that the camera non-linearities introduced by various different lens systems on a particular camera are compensated. In this issue, Part 3 will investigate setting up colourimetry and exposure as well greyscale adjustments using a waveform monit...

Submitted by Dennis Lennie

Published 01 May 2009

Filters for HD Cinematography

The availability of low-cost HD camcorders with film-style tools, like 24 frame-per-second imaging and quality lenses, has put filmmaking capability in the hands of many. To achieve a film-style look, a director of photography can add a compliment of optical filters. Such filters can not only make color and other corrections to the image as it is s...

Submitted by Dennis Lennie

Published 01 April 2009

HD Camera Measurements and getting the most out of your c...

IntroductionImage quality all starts with the correct alignment of the camera which is used to capture the scene either on location or in the studio. The conversion of light into electrical signals involves many processes which can affect the quality of the image. Understanding these various adjustments that are necessary, using a suitable camera c...

Submitted by Dennis Lennie

Published 01 March 2009

Chromakey tips and tricks.

Chromakey is one of those slightly magical effects that can still bring out the child in all of us. Also childlike are the frustrated tantrums you throw when you have been trying for hours to get a decent key, and realise you will have to pay some compositing wizard to rescue the shot. There are now 2 distinctly different ways to shoot chromakey fo...

Submitted by Dennis Lennie

Published 01 April 2008