A San Francisco Slide Challenge.
I’ve long been intrigued by the short section of the former Southern Pacific Bayshore Cutoff at the old Potrero Wye, where the railroad runs beneath I-280.
This location offers a graphic contrast; the immensity of the highway shadowing the railroad both literally and metaphorically.
The location also poses a photographic challenge. During high light, the tracks are completely within shadow, so I’ve found the best time to photograph is early in the morning or late in the day, when sunlight is below the bridge.
Yet, low sun also poses a problem, as calculating exposure is neither intuitive nor can a camera meter be relied upon. The overwhelming highway structure will tend to result in overexposure as a camera meter tries to compensate for the darkness, yet the side of the train reflects the full brightness of the sun (which to further complicate matters, may be less than sun at midday).
I made this photograph of an inbound Cal-Train ‘Baby Bullet’ in April 2008, using my Canon EOS 3 with a 50mm lens on Fujichrome slide film. I used my Minolta Mark IV handheld meter in reflective mode to sample the exposure on the side of a gray highway support column, and preset my camera accordingly. (I didn’t make note of the exposure, but it was about f5.6 1/500th of second.)
The resulting color slide looks just about perfect, but my exposure/contrast problem was repeated when I went to scan the image.
Here, I found the scanner software’s auto exposure had the reverse problem of my in-camera meter and tended to underexpose the scan. The result was not only too dark, but unacceptably contrasty.
I switched off the auto exposure, and instead used the software’s exposure histogram to set exposure manually as to better balance the highlight and shadow areas. Using this setting, I made a another scan. Afterwards, I fine-tuned the improved scan using Photoshop to make for a more pleasing image by adjusting both contrast and color balance.
This image is an exception; most of the time I’m satisfied with my first scan. Incidentally, the pictures reproduced here are scaled Jpgs from very large Tiff scans. The file size of the Jpgs is just a fraction of the original scan size, which is adequate for small-size internet viewing.
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