Time-lapse videos can flicker.

Anything that interferes with frame-to-frame regularity can make the scene's exposure change randomly.

Computer-driven apertures in still camera lenses are one potential cause.

Bracketed manual-exposure time-lapse exposures are possible, but managing them is a bear.

Auto exposures driving shutter speeds aren't perfect. Especially in dim light.

The shot here is an intentional examination of that shortcoming. The shot starts well AFTER sunset and records clouds from 1/20th sec to 13 seconds per frame all working with Aperture Priority mode in a Nikon D800. The autoexposure here is trying to make every frame a perfect middle exposure.

Toward the end of the shot, exposures were flickering quite a lot.

But our iNovaFX iFlickerFixer Photoshop Action was up to the challenge. This time in PS 6.

A preparation Action allows one to capture any four reference frames from early/mid/late moments in the flickering movie file. Those drive the correction.

The shot is nearly 30 seconds long, so rendering time was around 23 minutes. About 45 seconds of computing per 1 second of result.

Frames here are big. 5520 x 3680. You could swim around in them with an advanced Ken Burns effect. Or crop-n-zoom to your heart's content. Big enough for IMAX.

And they are only the 20 megapixel, Medium frames from FX mode of the D800.

Presumably, you could do this with Large frames, 7360 x 4912 pixels big.

The final scene combines tonal balances from four original frames, selected to represent desired tonalities. Notice how the processed result is self-consistent. You could change that with keyframed gradings.

iFlickerFixer v 4 is a tiny fix to the iFlickerFixer v 3 which is available to purchasers of the Actions PS CS5 eBook and software collection.

The eBook itself is free. The Actions it describes cost just $25 (and you get a high-res version of the eBook on CD).
Look to digitalsecrets.net.

Did I mention the eBook is iPad-friendly?

This video is one of a series created to show the motion image talents of the Nikon D800 for our new iBook, HDSLR: Nikon D800 Photography Course. Available before the holidays.

Note: Yes, we do see the tiny residual flicker here. But it's from multi-recompressions and format transcoding. The original processed file is pristine.

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