Whenever you see a magical views and then you take a photo! The result is often far from being the beautiful views you have seen. Why? The reason is our eyes are very adaptive to a broad bound of intensity of the real world, but the chip in camera is not that. How many f-stops can the human eye perceive? Science says that the research result has a weakness, but a best scientific declaration would be to say 24, but a digital camera can capture a dynamic area around 6 to 9 f-stops at most.
For quite a long time we have made efforts to increase the dynamic range of our photographic job. Recently, technique which has been developed is HDR photography.
The HDR (High Dynamic Range) imaging is a set of technollogies that has been developed in the latest 10 years to conquer the limitations of digital cameras by merging multiple exposures into one good looking photo. Different from it's predecessors of film, HDR photgraphy, like other aspects of postprocess can be done with the computer. It's good for use and somewhat user-friendly. It is able to be fulfilled by any software that allows the stacking of layers which have a changeable transparency. However it can also be done with special HDR softwre that concentrate on this one process. These are absorbing softwares. They merge the pictures with different exposures, and by analysing the colors, often bring out detail that or else will be lost.
Then how to create HDR pictures?
First off, you need to take the photos. Because you are going to create a high-dynamic-range picture, it makes a great deal of sense for you to set your camera so that it captures your photos in your camera's RAW mode. The reason for this is that the RAW mode catches more magical range info than is applicable in the alternative, the JPEG file. It also offers you lots of color temperature latitude -- you can setup the color temperature of all of your photos simply after the fact. You also need to set the camera to manual exposure mode. Use the tripod to fixup your camera so that it will not move, then compose the landscape you want to take a photo of. As far as we know, all of the HDR softwares require users to take not less than 3 pictures of the same scene, one under-exposure, one normal-exposure and one over-exposure. Okay, so you have at least three photos! Load them from your digital camera to your computer. Done? Done. Now, how do you take those three photos and create a new, magical HDR image? Simple! Nearly all of the HDR softwares would have an easy guide for you to add the pictures. Then merging images in the software into a high dynamic image. The final thing is to tone-map the HDR file so users will be able to see it in the screen, save it, show it on the web and enjoy.
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HDR is just another capability that may be used to enhance your images. Unfortunately, like any novelty, it can control your otherwise balanced visual sense. The goal still remains: keep details in both your shadows and highlights. In most cases, the FILL and RECOVER features in PhotoShop will let you do this. Many of the examples of HDR I've seen posted (even so-called "prized" ones), do not make a compelling case for it.

Personally, if someone were to look at one of my photographs and immediately fastens on the technical techniques ("How did you do that?" or "Nice HDR"), I would be very disappointed. I rather regard one of my photographs as an invitation to "see" in a manner that may not have been so obvious.

I'll likely use HDR in some cases, but...