HDR how? This is a simple how-to HDR tutorial to help you create amazing HDR photographs that make viewers say, “Wow!” When I saw my first HDR photo, I just had to find out how to take HDR photos, and how to process them. What I now know is that everyone can take an impressive looking HDR photo. Follow these easy steps and you can be creating HDR masterpieces today.
What is HDR photography?
HDR stands for High Dynamic Range. It result from the processing of one image, or even better, a series of images with different exposures. HDR photographs actually compress the amount of light in a photograph so it can be displayed in print or on your computer. For example, have you ever taken a photo directly into a sunset and noticed that the foreground is too dark to see? This is because your camera is adjusting its light meter for the bright sunset, and as a result the foreground becomes silhouetted. But with HDR photography, both the foreground and bright background will be properly exposed resulting in an amazing picture.
HDR tutorial – Step one – take three photos
Start by taking three photos at different lighting levels. You can do this very easily if your camera has a bracketing, or multiple exposure setting. Set the bracketing to 2 EV increments so that the first photo you take will be too dark, the second photo will be correctly exposed, and the third photo will be too light, or, over exposed. If your camera does not have a bracketing setting, you can manually adjust the aperture or go into the menu settings and manually adjust the exposure value (EV) settings between shots.
To be clear, the first photo should be taken at minus two EV, the second photo should be zero EV, and the third photo should be plus two EV. But, there is a key point here. Your camera should be set to aperture priority if you have this setting. This is usually denoned by an “A” on the camera. This means that your shutter speed won’t change while you take the three photos which will result in different depths of field and a blurry HDR image. And finally, ensure your ISO is set to your lowest setting to eliminate noise in the finished HDR image. This means an ISO setting of 100, and may also mean your resulting shutter speed is going to be a long one. But if you have a tripod, this shouldn’t be an issue.
- Set your ISO to its lowest setting
- Use aperture priority mode
- Set exposure bracketing (AEB) to take three frames at two EV increments, or five at one EV increments.
- Use a tripod if at all possible
Of course, you don’t want your camera to move in between shots so a tripod should be used. Having said that, I have taken many good HDR settings with my camera hand-held. To do this you need to hold your camera rock solid still and have your shutter set to a rapid fire mode so all you have to do is hold down the shutter release to take the three shots. Some HDR photos are taken with five or more frames instead of three. If your camera’s bracketing mode only allows you to take photos with one EV increments, then you will want to take five photos. If you can set it for two EV increments, then you only need to take three photos.
Trust me on this, three frames are all you need for the vast majority of high dynamic range settings. You may get a slightly enhanced tonal range with five shots, but you need to know in advance that five photos take much more processing time and you will find yourself sitting in front of your computer for long periods of time waiting for your HDR photo to render. Bottom line: three frames at two EV increments are all you need the majority of the time.
I shoot all my photos in RAW. If you don’t shoot in RAW, then it is high time you started. RAW photos are like a film negative. They contain so much more light information than a jpg image which allows you to make incredible adjustments to the shadows and highlights, and fix errors in exposure that would never be possible with a jpg.
Step two – upload your photos
The next step is to upload your photos into your computer and save them on your hard drive.
Now it is time to process them, and in order to do that you are going to need a piece of software that specializes in the processing of HDR photos.
I have searched far and wide for the best and most cost effective HDR software, and by far the best I have found is Photomatix Pro.
Photomatix Pro can also be installed as a plug in for Lightroom and Photoshop. I have tried both, and I recommend installing the stand-alone program instead of using it as a plug in. The stand-alone program is much simpler to install and use in my opinion. And lets face it, when you are learning about new software, it pays to keep things simple.
Once you have installed Photomatix Pro, please come back here and keep going through this tutorial.
If you shoot your photos in RAW, it is recommended you convert them into jpg or tiff files first. I didn’t know this for the longest time, and was importing my RAW photo files directly into Photomatix Pro for processing into an HDR image. But Photomatix recommends that you first convert your images to jpg or tiff using your favorite photo processing software such as Photoshop or Lightroom, and then import the converted files directly into Photomatix Pro. This is because noise in your finished HDR image will be greatly reduced if you create the HDR image using jpg or tiff files instead of with RAW files.
But there is a but here… if you have taken a photo of moving subject, then you can easily create a pseudo HDR image using one RAW file. It is incredibly easy to do, and again, requires only one RAW file. This is your easiest solution to create an HDR photo of moving subjects, but because it will only be a pseudo HDR image, the finished product will not contain the broad dynamic range that a conventional three image HDR image will.
Using Photomatix Pro
Start by opening the program. A box will appear. Click “Generate HDR image”. Select the three or five images you took using bracketing.
A second box will open. I always select “Align source images”, “By matching features.” This is a neat feature that will allign all three or five images so that slight imperfections in the framing will be compensated for. I find that even if I take my photos on a tripod, there is always a tiny shift that occurs between shots. Aligning the source images by matching features will line up all your frames perfectly.
I also tick “Reduce chromatic aberrations” and “Reduce noise”.
Next, if you have any objects that were moving between your three shots, you will need to tick “Attempt to reduce ghosting artifacts”, “Background movements.” You will be suprised how much a small breeze can move grass or foliage which will result in a blurry HDR image if you don’t tick this box. However, this feature will not be able to fix significant movement between frames.
Keep the tone curve of color profile on the default setting, and click OK. Now the software starts to work its magic. This might take a minute, or could take five minutes. It really depends on your computer’s processer, the number of images, and the size of the images. Once it has been processed, a button appears that says “Tone mapping”. Click it. This is where the real magic begins.
About the Author
Tim Shields – hdr-photography dot org.
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