What happens to image contrast when the window width is decreased?

When the window width is decreased, the image contrast actually increases. This is due to the fact that window width defines the range of grayscale values represented in the image. A narrower window width means that fewer shades of gray are used, which enhances the difference between the displayed values. As a result, structures within the image that may have similar densities will appear more distinct from one another, leading to greater contrast.

In the context of medical imaging, this increased contrast can be particularly beneficial for highlighting details in areas of interest, such as in diagnosing various conditions. Thus, manipulating the window width is a critical technique in optimizing image quality and diagnostic utility.