Which of the following is a post-processing factor that affects the displayed image contrast?

The post-processing factor that affects the displayed image contrast is window width (WW). In digital imaging, window width refers to the range of gray values that are displayed in a radiographic image. Adjusting the window width alters the contrast of the image by determining which pixel values are displayed as shades of gray. A wider window width results in lower contrast, as more ranges of values are displayed together, while a narrower window width increases the contrast by emphasizing a smaller range of values. Thus, effectively manipulating the window width is crucial for optimizing the visibility of different anatomical structures within the image.

Image resolution pertains to the detail and clarity of the picture but is more about spatial fidelity rather than contrast management. Scatter radiation, while impacting the overall quality of an image, relates more to the interference and potential distortion of the image rather than post-processing adjustments to enhance contrast. Film type could influence the inherent characteristics of the image captured, but it is not a post-processing factor affecting the displayed image contrast in digital systems. Therefore, window width is the proper aspect to consider when discussing contrast modifications during post-processing.