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Below are the 8 most recent journal entries recorded in digicana's LiveJournal:

Sunday, September 17th, 2006
6:15 pm
How to add my blogspot account as a friend here
I've had a few people mention to me that they wish I'd post to LJ more often because the friends feature lets them keep up with me -- well, it looks like LJ has added a new feature. Go to http://syndicated.livejournal.com/backingwinds/, and add backingwinds as a friend -- and bingo, every time I post to my blogspot blog, it'll show up here. :)
Monday, June 19th, 2006
7:25 pm
HDR shots of other D.C. landmarks
While I was in D.C., I also tried experimenting with HDR on some other familiar landmarks. This is harder than you'd think, as you have to avoid the attention of the park police, who get a bit fidgety about tripods. All were shot using 6 shots bracketed at 2 stops apart, assembled and downconverted with Photoshop, with the exception of the Capitol, which was shot on a 3 shot bracket, untripoded, because the police made me put the tripod away. The camera is an EOS 20D, the wide lens is a Canon EF 10-22, the lone telephoto is a Sigma 70-200. The success if varying. The Lincoln Memorial looks a bit wonky, but keep in mind that the sun is in the process of setting just to the right of where the frame cuts off -- this is shooting into the sun. HDR does a pretty good job of managing this!



4 below the cutCollapse )
2:13 am
HDR interior shots of the Library of Congress
I've been doing some interior HDR experimentation; it seems to be the optimal format for HDR work. I hesitate to call this architecture photography because the ultrawide by nature distorts the hell out of everything, but it's creating some good results. These were all done using multiple exposures (usually six exposures at 2 stop brackets), tripoded with cable release. Files were merged and downconverted using Photoshop.



5 more below the cutCollapse )
Saturday, May 27th, 2006
7:23 pm
May 26 Chase
Well, yesterday caught me by surprise! I was back in Kearney, visiting the fam, when Darren Addy called me at around 4PM and asked me if I'd been watching the weather. I hadn't. :) But a quick check of the surface obs and the RUC hinted that if I was willing to drop just a bit south into northwestern Kansas, it might be a fun day. So, I quickly got the car ready (you've never seen me Rain-X so fast!), swung by to pick up Darren, and off we went. We dropped south from Holdrege, and as we did, we could see that the cap had definately broken to our southwest. As we approached the storm that was east of Hill City (at around 6PM, IIRC, though my timeline is fuzzy), the sky was putting on one heck of a mammatus display:



Rest of report and lotsa nifty photos below the cutCollapse )
Tuesday, May 9th, 2006
7:11 pm
HDR experiments
For some time now I've been experimenting around with a photographic technique known as HDR -- "High Dynamic Range" -- imaging. Essentially, the principle behind HDR is that a digital, and to some extents even a film camera can only capture a very narrow range of dynamic lighting information, especially when compared to the human eye and brain. For example, when you are standing outside in broad daylight and you look at your friend, who is standing in the shadow of a tree, you can see him or her just fine. You can also see the parts of the ground that aren't in shadow just fine, and likely the sky just fine too, even if you're looking right into the sunlight. However, with a camera, it's different. With a camera, you must conciously decide whether or not you want the person in the shadow to be rendered correctly, or the ground that is out of the shadow to be rendered correctly, or the sky to be rendered correctly. If you, for example, choose the sky, then when you get the photographic prints back, the ground will be dark and your friend will be entirely covered in the blackest of shadows. If you choose your friend, then the sky will be white, not blue, and the ground that isn't in shadow will be extremely bright and washed out. This is a limitation of the technology; with film, it's a limitation of chemistry, with digital cameras, it's a limitation of the engineered design of the chip that captures light information. The human eye and brain outperforms all cameras in this aspect by a very significant margin.

However, HDR attempts to try to compensate for this. Essentially the photographer takes several photographs of the same scene and blends them together using a computer algorithm. Now, for example, the photographer would take picture in which your friend is rendered correctly, then take a picture in which the sky is rendered correctly, then finally take a photo in which the ground is rendered correctly. He would feed these digital photos into a computer algorithm, and after a lot of manual tweaking of the image, the computer will spit out an image in which all three -- ground, sky, and friend -- are correctly rendered. It's not magic, but it's damned close.

My last batch of HDR images were of the Nebraska Capitol building exterior at night. Today, I decided to walk over to the capitol and try this technique on the interior. I got some pretty cool (in my opinion!) results.

It's all below the cut, as they're quite large.
DUW! 10 photos or so below the cutCollapse )
Friday, April 28th, 2006
4:02 pm
Friday, April 7th, 2006
9:42 pm
Monday, January 23rd, 2006
11:52 pm
No estoy aqui
I don't do the whole livejournal thing, though I do have a storm chasing blog over at Blogger. During the offseason, it'll probably be full of boring stuff of little interest to ya. In the on-season (April to late August, especially May, June, and July), it'll mostly be full of meteorological techno-jargon and pictures of tornadoes doing their best to kill me dead. Here's a few from last year:

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(That's the DOW-2 mobile doppler truck on the left)
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