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If you have been photographing for more than a year or two, you will have heard about HDR (which stands for High Dynamic Range). We have probably seen them, the “overcooked”, over processed HDR images that float around the photo websites. For some photographers, the process seems to force them to overdo their images and after a while that seems to be the only result they are trying to achieve. Do a Google search on “bad HDR” and you will see what I mean. The images have halos, the colours are surreal and look metallic, the contrast is off and in short, the image is really messy.
When I first shot HDR, I fell into this trap too. These results caused many photographers to say that HDR is not a useful technique and is really gimmicky. That perception is partly true. HDR in the hands of someone who cannot use it effectively can result in some weird looking images, however, HDR done properly can produce some incredible results. To see some good examples of HDR done properly, visit the website HDR Spotting and take a look at the editors picks. There are some astounding images there. The colours are amazing, the contrast is perfect and the detail in the shadows and highlights, sublime. That is what HDR should be. It should be the best combination of the highlights and the shadows properly exposed, the image should look as real as it can. So, how do you get this right you might be asking, read on to find out.
As I said earlier, HDR stands for High Dynamic Range. Your cameras sensor has the ability to capture light and colour. The extent to which your camera can do this is called the dynamic range. More specifically, if your camera can render lots of details in the shadows and the highlights in the same shot, then it has a high dynamic range. Over the past few years, digital sensors have become so much better at capturing more detail. This is a huge benefit for photographers and of course for HDR photography. This means that we can get more details out of every image and as a result, the HDR images will be that much more detailed.
Making an HDR image involves 3 distinct and separate processes. I will go into detail on each one, but at a high level, they are as follows:
Lets start with image capture first. This is the photography part of this process. It’s pretty simple really. Set up for your shot as you normally would. Make sure you have your subject well composed and you are ready to go. The difference between HDR and normal photography, is that with HDR you will take either three to five bracketed images of the same scene. The reason for the number of images is that you will blend these images together in a dedicated HDR product.
My recommendation for HDR software is Photomatix Pro. It is a programme that has been around for many years now and has some really good editing functions. It’s probably the most widely used software when it comes to HDR. Photoshop also has an HDR function, but in my opinion, its not as refined as the Photomatix Pro yet. Don’t get me wrong, I am a huge Photoshop fan, it is an incredible tool, I am sure that Photoshop will have something within their functions that will be competitive in time, but for now, I still use Photomatix.
These are the steps I follow when I intend to do an HDR shot. They are not rules, nor are they inflexible, they just work for me. You need to find what works for you and gives you the best results, this method has helped me get my best results, so try it out. Tweak it and change it as you need.
This will result in five images being captured.
Below are the three images I used in making the HDR image you see above. Take a look at how the colours and exposure don’t look good at all.
Some photographers use five shots for their HDR shots, some use seven or up to nine. I have found that three to five shots seem to work best for most scenes. I have only used nice shots on a few occasions, but have not been happy with the results. The colours seem to be “muddy” and unclear once processed. If necessary, shoot seven images and see how that works.
Once you have completed the shoot, download the images to your computer. It is important NOT to edit the images before blending them into an HDR image. Some of the shots might look over exposed or under exposed, thats OK, in fact they must look like that. The software will deal with these issues, so don’t be concerned that the images look bad out of camera, they need to be processed and then the magic begins.
I will be explaining the Photomatix software in this article. I have tried HDR with each new version of Photoshop and I am still happier with the results I get from Photomatix Pro. You can download a trial version of Photomatix from their website. It is fully functional, the only thing is that the trial version puts a watermark on the image. This is OK for trying it out, you will see exactly what the software can do, if you think it is worth it, then you can buy it. Ok, so here is how you take your images into Photomatix Pro
Preprocessing options are available. Make selections on the box as shown in the screenshot above. Then click preprocess and Photomatix Pro will begin to tone map the images into a composite 32-bit image. This process is generally quite quick, between 30 seconds and a minute. Once complete, click on the Tone Mapping button.
Use the “Remove ghosts” function if you have people or moving objects in your images. If you don’t have this, then you wont need to use this function.
On this screen, you are able to select a variety adjustments that will create an overall change to the image. There are no absolutes here. Each adjustment makes minor or major differences to the image and the combination of the adjustments provides diverse options.
At the bottom of the screen you will see different “treatments” (or presets) which you can use as a starting point to your image editing process. I would avoid using these as they are generally overdone. Try and use the functions on the left hand side to edit your image.
Below are the details about each function on the left hand side of the screen and what each does. One of the best ways to see what a function does is to slide it all the way over to the left and then to the right and see how it affects your image, but here are the details:
Once this part of the process is finished, then it is time to take the image into Photoshop. Save the tone mapped image and then re-open it in Photoshop.
This is a very basic workflow. It will enhance the lighting and tonality in your images. These techniques are discussed here at high level.
Photoshop has a function called Shadows and Highlights. Use this tool to bring out detail in the shadows of your image. Use it carefully, if you overdo the treatment on the shadows, there may be some unsightly image degradation or “noise”. This function is not great for adjusting highlights, so use it for the shadows only. This tool is found in Photoshop as follows: IMAGE > ADJUSTMENTS > SHADOWS AND HIGHLIGHTS. The adjustments of AMOUNT, TONAL WIDTH and RADIUS should all be kept aligned close to one another to ensure that the adjustment looks realistic.
The levels function in Photoshop is for adjusting the lighting in an image. This means that if your image is a little dark you can push up the exposure slightly and see more details in the image. The levels function shows a representation of a histogram. Move the sliders in to touch the edge of the histogram as a general rule. This will ensure that your image has a good representation of highlights and shadows.
Once the exposure and lighting has been adjusted and looks correct, then you may begin adjusting the colour in the image. The tool to use will be the Hue and Saturation tool. The important tip here is not to adjust the master channel but rather to adjust by each channel independently. To do this, click on the top toggle button that says “default”. A drop down menu will appear and each colour channel will be available from there. Slide the Saturation Slider to the left to desaturate (remove colour) or to the right to saturate. That way you have the best control of the colour in your image.
These functions are localized adjustments. By using a brush tool, you are able to make certain areas of the image darker and other areas of the image lighter. This is useful for adding the finishing touches to your image. There is also the sponge function which is a saturation tool which can saturate colours at a local level.
Almost every image that comes out of a digital camera requires sharpening of some sort. The easiest and quickest tool to use is the Unsharp Mask tool and it works effectively.
The Unsharp Mask has three separate sliders: Amount, Radius and Threshold. As a general rule you can keep the Amount anywhere between 80 and 120%, Radius can be set between 1.0 and 3.0 pixels and Threshold is generally at zero. Adjust the sharpness of the image according to each image requirement and beware of degrading the image by over sharpening. You will easily notice if an image is over sharpened by the appearance of a “halo” around certain edges in the image. The idea is to sharpen the image but not make it overly sharp and lose image quality.
Once you are done, save your image and thats it! Have a go, try different settings in different light, let me know what you think and how your images turn out. If you have any questions, drop them into the comments box below.
Please leave your comments and questions below. If you want more HDR tips, try some of these articles:
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