Saturday, September 27, 2014

Timelapse - Distant storm formation at Markonahalli Dam

Here is one more old timelapse which I love very much. The nimbus clouds forming distant storm is mesmerizing sight to watch. Due to such patterns of nature, I love monsoon season whole heartedly. So how did I capture this? You need some experience of watching the sky especially during monsoon season. The whitish nimbus clouds illuminated by Sunlight turn dark as they shadow the sunlight. Such scenes are normal in coastal Karnataka and occur frequently during monsoon season. My curiosity towards monsoon makes me to watch at sky most of the times during monsoon season. Consequently this was one such scene which I could capture it as timelapse. The final video is edited in KDENLIVE for various parameters which I dont remember now. I aspire to capture more such timelapses during monsoon season. Hope you enjoy the timelapse.

The movements are achieved by usual cropping techniques. A little bit of boring math for cropping. The initial plane of frame was as shown in dotted line and final frame I wanted to achieve is shown as solid rectangle. Note that I wanted to maintain the the aspect ratio intact (which was 3:2). If not, the final frames would be clipped and video looks erroneous! The resolution 550D has is 5184x3456 pixels which is aspect ratio of 3:2. The motion time lapser counts (0,0) axis from top left and hence some offset corrections needs to be done to achieve movement. Consequently I fixed (x,y) co-ordinates to (0,1000) and later move the plane towards (1500, 0). To achieve this and fit the images to frame the offset correction goes as below

Frame length: (5184-1500),(3456-1000) = (3684,2456)
Movements from (0,1000) to (1500,0) with frame length of (3684, 2456).

Despite of this calculation, I had some clippings in last few images. May be algorithm used by Motion Time Lapser is different and hence I restricted final 'y' co-ordinates to (1500,200). The final math goes as

Initial (x,y)=(0,1000)
Final (x,y)=(1500,200)
Frame length=(3684,2456)

The final figure is as below. So what's the rule? There is no rule as such! It is upto your discretion to decide the co-ordinates to align with desired movements and speediness. Draw your desired movements on sheet of paper, execute simple math and set the co-ordinates in motion timelapser software which can be downloaded from here

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