How you can do this? Different software let you do this easy, is not rocker science. Photomatix, photshop, picnik
How to shot it? just one picture or the pictures with the several stop. A High Dynamic Range Image is composed of 3 to 7 of the same image at different exposures. Each image is at perfect exposure for every level of brightness in a scene. How we adjust the exposures is critical. If we kept the shutter speed constant and adjusted the aperture, this would give us varying Depths of Field–an unwanted characteristic. We want all the shots to look the same, only varying in exposure. We couldvary the ISO, but higher ISOs add more noise and we want as noise-free an image as possible. Since HDR is an additive process any noise will be multiplied. So that leaves us with one choice: Shutter Speed. Or the other easy way is Auto Bracketing must camera have.
My examples:
need a little bit more help go to this website that i found is really helpful : source
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