RGB Channels

The RGB Channels are three color channels used to define pixel color in 24-bit raster graphics systems.

RGB
RGB stands for:
 * Red
 * Green
 * Blue

Each single channels of the three are a single byte (8-bits), with values ranging from 0-255.

Writing RGB Values
RGB Values are written by putting the three numerical values in the order R, G, B - all comma separated.

Principals
RGB colors are the three main additive colors. When the value of these three channels increases, the brightness of the image increases.

Based on that, we know that:
 * (0,0,0) is black.
 * (255,255,255) is white.
 * (255,0,0) is red.

Alpha channel
In 32-bit raster graphics systems, the RGB channels are used (24 bits) with an additional 8-bits reserved for the alpha channel, which defines the transparency of a pixel color.