What does changing the image contrast typically involve?

Changing the image contrast primarily involves altering the window width. In digital imaging, window width refers to the range of pixel values that are displayed in the final image, influencing the level of contrast. A wider window width means that more pixel values are included, which results in less contrast, as there are more shades of gray. Conversely, a narrower window width limits the range of pixel values, thus enhancing contrast by creating a stark differentiation between lighter and darker areas in the image. This capability is crucial in mammography for effectively visualizing subtle features, such as microcalcifications or fine tissue details.

Adjusting the brightness is related to the overall lightness or darkness of an image and does not affect the contrast itself. Modifying the window level involves shifting the midpoint of the displayed pixel values but does not necessarily impact the contrast unless combined with changes to the window width. Increasing the resolution mainly pertains to the clarity and detail of the image rather than its contrast properties. Therefore, altering the window width is essential for achieving desired contrast levels in mammography images.