WHAT IS DESIGN FOR PRINT?//RGB//OUGD504

RGB:

Photoshop RGB Color mode uses the RGB model, assigning an intensity value to each pixel. In 8‑bits-per-channel images, the intensity values range from 0 (black) to 255 (white) for each of the RGB (red, green, blue) components in a color image. For example, a bright red color has an R value of 246, a G value of 20, and a B value of 50. When the values of all three components are equal, the result is a shade of neutral gray. When the values of all components are 255, the result is pure white; when the values are 0, pure black.

RGB images use three colors, or channels, to reproduce colors on screen. In 8‑bits-per-channel images, the three channels translate to 24 (8 bits x 3 channels) bits of color information per pixel. With 24‑bit images, the three channels can reproduce up to 16.7 million colors per pixel. With 48‑bit (16‑bits-per-channel) and 96‑bit (32‑bits-per-channel) images, even more colors can be reproduced per pixel. In addition to being the default mode for new Photoshop images, the RGB model is used by computer monitors to display colors. This means that when working in color modes other than RGB, such as CMYK, Photoshop converts the CMYK image to RGB for display on screen.

There are many models used to measure and describe color. The RGB color model is based on the theory that all visible colors can be created using the primary additive colors red, green and blue. These colors are known as primary additives because when combined in equal amounts they produce white. When two or three of them are combined in different amounts, other colors are produced. For example, combining red and green in equal amounts creates yellow, green and blue creates cyan, and red and blue creates magenta.

As you change the amount of red, green and blue you are presented with new colors. Additionally, when one of these primary additive colors is not present you get black.

UNDERSTANDING COLOUR MODELS:

Color Model is a simple chart that defines a range of colors.  It represents different method for describing and classifying colors we see.  Color models uses numeric value to represent a color.  The most common Color Models are RGB, CMYK and HSB. 

RGB COLOUR MODEL:

RGB is a additive primary color model that uses the components red (R), green (G), and blue (B) to define a color.  The name of the model comes from the initials of the three additive primary colors, red, green, and blue.  The combination of these components defines a single colour.