However, increased color depths also require significantly more memory for storage of the image, and also more data for the video card to process, which reduces the possible maximum refresh rate. 16,777,216 3.0 True Color True color is given that name because three bytes of information are used, one for each of the red, blue and green signals that make up each pixel. Since a byte has 256 different values this means that each color can have 256 different intensities, allowing over 16 million different color possibilities. This allows for a very realistic representation of the color of images, with no compromises necessary and no restrictions on the number of colors an image can contain. True color is a necessity for those doing high-quality photo editing, graphical design, etc.
High color uses two bytes of information to store the intensity values for the three colors.
A palette is created containing 256 different colors. So the full range of color can be used in each image, but each image can only use 256 of the available 16 million different colors. A digital image is composed of pixels arranged in a rectangular array with a certain height and width. Each pixel may consist of one or more bit s of information, representing the brightness of the image at that point and possibly including colour information encoded as RGB triples. See also image formats , image processing .