Question

One of the most important aspects of digital imaging is the ability of the computer to mathematically change the image's brightness and contrast. Which of the following controls image brightness?

a. LUT (Look-Up Table)
b. Histogram
c. Window width
d. Matrix size

Answer 1

The Look-Up Table (LUT) is responsible for controlling image brightness by mapping input pixel values to new output values, altering the image's overall brightness.

Step-by-step explanation:

The control that allows us to change an image's brightness is known as the Look-Up Table (LUT). A LUT is a mathematical table that maps input values (in this case, pixel values in the original image) to new output values (changed pixel values), which can increase or decrease the brightness of the image. When we adjust the LUT, we effectively change the intensity values of each pixel, thereby altering the overall brightness of the digital image. This process is integral to image processing in fields such as radiology, graphic design, and digital photography.

While other controls such as histogram can represent the distribution of pixel brightness and window width is related to the visible range of brightness in medical imaging, the LUT is directly responsible for adjustment of the brightness in an image. Matrix size, meanwhile, refers to the number of pixels in an image and affects the resolution rather than brightness or contrast. In high-definition imaging systems such as flat screen LCD televisions or microscopes, precise control over brightness and contrast is essential for creating clear and accurate visual representations.