With many architectural jobs, the range of light in the image can be very wide, from full sun to dark shadows. Whilst modern cameras have very wide dynamic ranges, it is still impossible to capture all the tones in one image without using quite powerful and expensive lighting. A way around that is to take a series of images and combine them to create one picture.
Using a program such as HDR Efex from NikSoftware, allows the combination of a number of images (I use 5) ranging from correctly exposed highlights through correctly exposed midtones to correctly exposed shadows. These are then combined to create an image that best represents the complete scene. Note: care must be taken not to overdo the effect which can lead to an unreal and false looking image.
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