According to About.com, under the RGB system that web designers use to create the colors on computers, fuchsia is made from equal parts red and blue. From a web design perspective, there is no difference between fuchsia and magenta.
The formula for fuchsia under the RGB system is 255,0,255. The first column represents red, the second column represents green and the third column represents blue, thus the designation RGB. The values of these columns range from 0 to 255, which means that the formula represents a full value of red, a complete absence of green and a full value of blue.