In this topic, you will learn about, Uses of the RGB Color Model.
RGB in Display
The main application of the RGB color model is to display digital images. It is used in cathode ray tubes, LCD displays, and LED displays such as television, computer monitor or large screens. Each pixel on these displays is built by using three small and very close RGB light sources. At a common viewing distance, these colors cannot be distinguished separately and viewed as a single solid color.
RGB is also used in component video display signals. It consists of three signals red, green and blue which carried on three separate pins or cables. These types of video signals are the best quality signal which can be carried on the standard SCART connector (A SCART connector is used to connect two electronic devices such as a television set and a video cassette recorder (VCR) or DVD player. Each device has a female 21-pin connector interface. A cable with a male plug at each end is used to connect the devices).
RGB in Cameras
Digital cameras for photography that use a CMOS or CCD image sensor (Stands for “Charged Coupled Device.” CCDs are sensors used in digital cameras and video cameras to record still and moving images. The CCD captures light and converts it to digital data that is recorded by the camera. For this reason, a CCD is often considered the digital version of the film.
The quality of an image captured by a CCD depends on the resolution of the sensor) mostly perform with some type of RGB color model. Current digital cameras are equipped with an RGB sensor which helps to perform the evaluation of light intensity in a crucial manner. And this results in the optimum value of exposure in each image.
RGB In Scanner
An image scanner is a device that scans a physical document and converts it to digital form and transferred to the computer. There are different types of such scanners and most of them work based on the RGB color model. These scanners use a charge-coupled device or contact image sensor as the image sensor. Color scanners often read data as RGB values and these data are then processed with some algorithm to convert to other colors.
- No transformations required to display data on the screen.
- It is considered as the base color space for various applications
- It is a computationally practical system.
- With the help of additive property, it is used in video displays
- It relates simply to CRT applications.
- This model is very easy to implement
- RGB values are commonly not transferable between devices
- Not perceptually uniform.
- Not perfect for identification of colors
- Difficult to determine specific color
- The difference between colors is not linear
Examples of the RGB Color Model
- Photography: Experiments with RGB in color photography were started in the early 1860s. And thus made the process of combining three color-filtered separate takes. Most standard cameras capture the same RGB brands so the images they create look almost exactly what our eyes see.
- Computer Graphics: RGB color model is one of the main color representation methods used in computer graphics. It has a color coordinate system with three primary colors.
- Television: World’s first television with RGB color transmission was developed in 1928. And in 1940 experiments on the RGB field sequential color system was started by the Colombia broadcasting system. In the modern century, RGB shadow mask technology is used in CRT displays.