The intensity of light generated being an exponential function of the applied signal, wherein the numerical value of the exponent of the power is known as gamma. This non-linearity of light intensity is compensated in order to achieve correct reproduction of intensity. For a video system, gamma correction transforms linear-light intensity to nonlinear video signal.

Gamma correction on samples proportional to intensity require at least 12 bits of green, blue and red for enough precision. Due to human eye' subjective perception of brightness, applying gamma correction before quantizing on measured light intensity results lesser bits for storing the image. 8 bits per color suffices the need to avoid contouring artifacts.

The core provides an efficient means to perform gamma correction on the image data from any color system using LUTs that have prior calculated gamma corrected values. The GCR core is widely used in variety of application like video, image processing or display systems. It takes 24-bit color input, along with an input clock (in the order of 8-bits/channel) and converts it into equivalent 24-bit of desired output color format.

Features

• Supports 24-bit RGB color inputs and outputs
• Programmable gamma corrected values
• Supports individual color gamma value configuration
• Low conversion latency