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What is HDR in photography?

  • AGriffin
  • June 13, 2012
  • No comments

What is HDR in photography?

You see it popping up all over the place, you keep hearing the term HDR. Even our iphones and now the 5Dmkiii and T4i have built in HDR modes. But what is it?

HDR in photography simply means High Dynamic Range. Meaning, we have a photograph where almost nothing is under or over exposed. Or the range of light captured by a camera’s sensor is broader than what the camera or human eye can see.  

If you want some great tutorials on I’ve started an HDR Photography How to Guide on my Photography Tips page.

Here are a few examples of my HDR Photography

HDR Photography

The Canon 5Dmkii sensor captures a usable dynamic range of somewhere around 9-11 stops depending on your ISO and the quality you’re looking for. The human eye sees at a dynamic range of around 6.5 stops, but we think we see more because the eye is constantly moving and adjusting to compensate.  (A ‘stop’ is a standard measurement of exposure. It’s the Focal length of your lens divided by the diameter of the aperture. S = F/D)

When we see something like a sunset, the dynamic range of the scene might be somewhere around 12-15 stops. With a camera that shoots at a range of only seven stops, there is no way to capture the full exposure range of the scene in one photo. So how do we get everything to be exposed to give us an HDR image?

We use multiple photos set to expose in a different range then combine them into one.

Here is an example of what I mean.

Here is a photo of Hermosa beach exposed for the sky. The sky is exposed to capture it’s contrast and color but everything else is too dark.

Here is a photo exposed for the pier. Now the pier is exposed but the sky is overexposed and we no longer see the clouds.

And here is one more photo that is between the two. The sky is partly overexposed, and there are areas where the beach is under-exposed.

Now, here is what they look like if we combine all three.

This is what HDR photography is. High Dynamic Range Images.  It almost looks fake, which is part of the art of HDR. Getting that full dynamic range without it screaming digitally enhanced.

There are a few programs out there that let you combine photos into a single HDR photo. I used Photomatix Pro for this shot. You can also use Photoshop or HDR Efex Pro

I personally like Photomatix.  And more and more cameras are having this feature built into them. Like the 5Dmkiii the Canon T4i and the new Canon EOS M. 

**This website contains affiliate links. If you want to support this site, we will earn a small commission on any purchase made through these links.
AGriffin

Professional editor, blogger and photographer from Los Angeles California.

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  • HDR Photography
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