Sunday, July 25

Testing Narrow DOF

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Fortunately I have this virgin image (direct from my FlashCard) of a cooperative model who I got to stand outside of the gym against a corrugated red tin wall on the anniversary of his first full year of dieting and training (July 9, 2010). This secluded side of the building was in shade with the main indirect sunlight coming right to left. There was an unpainted cement wall off to the left which acted as a natural reflector. All of the light sources were natural and sufficiently bright at 6:14AM on a July morning to allow a low ISO (200). In other words, perfect conditions to capture a tack sharp image with max Depth OF Field (DOF), particularly from some 15 feet away from the model.

The goal here on my fifth test of the beta version of Bokeh2 is much more modest than the former playful attempts to use it as a stand-alone graphic device. Now I'm looking at its ability to compliment an image without imposing itself upon the viewer. I wanted to make it as invisible as possible to simulate the natural DOF of a long lens opened to it widest aperture. To that end I cropped the original layer and used PS4's content aware scale to turn the image into a horizontal. Of course I eliminated distracting imperfections in the tin wall behind the model.

Why a horizontal? Well the original is a snapshot with the model standing dead-center almost up against the red corrugated surface. So this altered composition applies the rule of thirds to powerfully draw attention to the key subject.

Okay, now I duplicated the cropped layer and then opened that duplicate in the Bokeh2 filter. There I simply chose from the preset lenses simulated in the application and picked the Canon 300mm f/2.8L@f2.8. I rendered the new layer, masked it, then painted away the blur over the model.

From there I duplicated the visible onto a new layer and using an adjustment curves layer, reconfigured the dynamic range of the image to emphasize the highlights in the wall while darkening its shadows. Again, I masked out the model. Which was pretty much the entire operation (except for a couple of sharpening steps of course).

Finished Image & Geek Data:
Camera: Canon 7D, Lens Canon EF-S 17-85mm, Focal Length 47mm, Aperture f/5.4, 1/80sec, ISO 200.
Processed: PS4, Bokeh2

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