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Welcome to Michael's blog. Michael Andrew, (aka Michael The Maven) is a freelance producer, photography instructor, tech innovator, and when needed, disaster aid specialist. Disclaimer: Michael is a participant in Bhphoto & Amazon affiliate programs that provides an advertising commission if you purchase through links on this website.


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01.17.08         photography  

HDR High Dynamic Range


Cameras are limited by the range of light intensities they can interpret, depending on the format- JPG's have an 8 bit depth, which means, according to the binary language of computers, JPGs only see 256 shapes of light, from dark to light. RAW files have 14 bit depth. HDR, or High Dynamic Range images can see up to 32- bit depths of light intensities, the problem is, this far exceeds the capacity of the camera. How do we do it then?

You use a tripod and a remote shutter release and take three images (you can also use bracketing to keep it simple). The keys are:

1. Do not move the camera.
2. Take 3 pictures, one under exposed, one exposed normally, and one over exposed.
3. Change the f-stop values by at least 1 f stop, change it by shutter speed, not aperture. (otherwise depth of fields will not converge correctly).
4. Use photoshop to merge the 3 images into a single 32 bit HDR file.
5. Adjust and tweak as needed and then export.

This was my first attempt at HDR, not the prettiest, but it was cool enough to make the magazine. I actually think I like the over exposed one the best.
Under Exposed
Normal Exposure
Over Exposure
Merged Image

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