High Dynamic Range Processing

High Dynamic Range or HDR has become a standard and often used tool when I’m in the field.  For example, a few weeks ago when I was shooting sunrises in Bryce Canyon we would arrive well before sunrise.  Generally I would start shooting when it was light enough to get a good exposure at 30 second, ISO 100 and f/16.  That’s a good 20 to 30 minutes before the sun peeks over the horizon.  In that wonderful pre-sunrise light the dynamic range is very low, maybe a total of four or five stops.  There is no need for HDR because under those circumstances I can get a good 8 and if I want 9 stops of dynamic range from my sensor.

But as soon as the sun is above the horizon all that changes.  The dynamic range jumps to at least 8 stops, probably more.  (I don’t take the time to scintifically measure the dynamic range because things happen so fast in those first few minutes.)  I don’t want to take any chances with that incredible light so I switch to HDR, just for insurance if nothing else.

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Shooting in Southern Utah

It was a week ago today that I arrived home from a week of shooting in Southern Utah.  As wonderful as California is with its beaches, mountains and deserts, Utah has to be one of the most exciting places on earth.  The air is clear and the vistas, breathtaking.  I remember the first experience with the Grand Staircase part of Utah when I was much younger thinking this was the real West, the likes of which you saw in early Westerns.  And for good reason as a lot of early Westerns were shot in Utah.

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Zion Canyon Journal – Session 2

Well, as anticipated, I didn’t particularly like the print from last night.  I seem to be having a problem with creating images that are way too cool in the shadows.  So, how best to warm up the shadows?

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Zion Canyon Journal – Session 1

What I’d like to do is keep a journal of the steps I go through and the decisions I make when creating the Zion Canyon print.  It was shot on 11/24/2007 near the Great White Thrown turnout.  I was there the day before closer to sunset and realized this shot needed to be taken about an hour earlier.  So I came back at 4:15 the following day.  The shot required both stitching (vertical panorama shots) and HDR (three exposures bracketed at +/- 1 stop) for a total of six shots.

The image was shot down by the Virgin River although it’s not in the picture.  The foreground is a meadow in the shade with two cottonwood trees.  The middle ground is a Navajo sandstone cliff jutting in from the right, also in the shade.  The background is a tall cliff, also Navajo sandstone, that is still catching some sunlight.  The sky is cloudless and blue.

Here then are the steps I’m going through to take these six shots from RAW to a finished print.  It will probably not be completed today.  Sorry I can’t show the before and after of each step.  That would be interesting.

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