This is another photograph that a lot more work went into getting right than I would have thought. The site itself isn’t particularly difficult to get to – the Seal Rocks are just off the Cliff House on the north end of San Francisco’s Ocean Beach.
The photograph is a reference to a Carleton Watkins image from 1868. A few factors had to come together to make it all work. It had to be shot on an overcast day to get the kind of soft horizon and transition from the sea to the sky that I wanted. And it had to be a pretty long exposure to get the water to “smooth” out. It took me a long time to figure this out – and with 8x10 film costing about $50 every time you take a picture – it cost at lot of money to make.
I eventually had to get a neutral density filter for the 8x10 camera to ‘slow’ down the exposure time to get it closer to what it would have been for the less sensitive emulsions used in the 19th Century. -Trevor Paglen
-Circle Hough Transform: circle detector, depicted as white circles -Region Agency Graph: older AI used in guided missles, depicted as jagged lines -SURF: AI looking for regions of complexity (similar to SIFT, but more efficient computationally); depicted as vertical black lines -Watershed: basic AI defining regions of an image; depicted as various geometric shapes that loosely conform to a region of the image. -Good Features to Track: AI detecting points of interest; depicted as small white circles (on the rocks).