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slit scan review

In the end I didn’t bother to assemble a video clip from my slit scan experiment. Many of the frames were over-exposed, which I hadn’t spotted during the shoot because I’d been concentrating on trying to move the camera as smoothly as possible. I must have slowed down for the later frames.

Anyway, here’s the first frame. The remainder should have been similar but with the image moved slightly under the slit each time.


I wouldn’t say that the test was a complete failure, as it gave me lots to think about. It didn’t however, produce anything like I hoped it would.

I should be clear about how I did this. I wasn’t using the approach where different parts of an image are taken from different frames and are therefore separated by time, leading to peculiar warping effects (which seems to be the basis for most examples available on the web, especially those created through After Effects, Quartz Composer or Processing).

My technique was based entirely on an article by Martin Kelly who used to create slit scans professionally. He describes it as “an extremely simplified form of the highly complex sequences needed for 2001: A Space Odyssey”. The diagrams included in his article show the diagonal smearing of light from the centre of the screen to the edge.

Give or take the adjustments required to line my images up properly, that’s what mine looks like – diagonal smears. They bear no relation to the varied textures visible in 2001. It isn’t just a matter of simple disturbance, described in the short documentary among the DVD extras, because they move smoothly outwards from one frame to the next, so there is continuity.

I’ve already achieved the effect of my analogue approach using Processing, and it would be simple to add random imperfections to simulate the variations in brightness resulting from the low tech, hand-made nature. I can’t see how to leap from this to the Doug Trumbull look though, so I’ve ordered a back issue of Cinefex 85 which has a “comprehensive retrospective” of the film. The magazine is coming from America and will take several weeks to arrive, so I’ll turn to other things in the meantime.


Saturday, June 12th, 2010 photography

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