The contrast control on a display adjusts the luminance range of the image. Specifically, it modifies the difference between the brightest possible white and the darkest possible black. Increasing the contrast makes the whites brighter and the blacks darker, thereby expanding the dynamic range of the image. This control directly affects the perceived "punch" or vividness of the picture by manipulating the scale of light and dark values.

CertEmpire.com

1. AVIXA. (2020). CTS Certified Technology Specialist Exam Guide, Third Edition. McGraw-Hill.

Chapter 5, "Creating AV Solutions," defines contrast as "The range of light and dark values in a

picture."

2. Poynton, C. (2012). Digital Video and HD: Algorithms and Interfaces (2nd ed.). Morgan

Kaufmann (an imprint of Elsevier, an academic publisher). Chapter 7, "Gamma," discusses how

contrast controls alter the tone scale, which is the relationship between the darkest and lightest

areas.

3. Georgia State University, Department of Physics & Astronomy. (n.d.). HyperPhysics: Contrast.

Retrieved from http://hyperphysics.phy-astr.gsu.edu/hbase/vision/contrast.html. This resource

defines contrast in terms of the relative difference in luminance or color that makes an object

distinguishable.