Computer Hardware: Colour Monitor


The final stage in developing our understanding of a full colour display shows the combination of three individual video memory (VRAM) matrices for an R,G,B output. Each colour is handled separately; turning any two pixels OFF of the three in the triad would result in a single colour display. The colour mixing takes place within the human eye where the red, green and blue pixels are activated to varying degrees. As previously shown the eye integrates the colours at each triad of pixels and interprets the colours depending upon the intensity of each pixel. Red and green bombarded equally by electrons with blue OFF will be viewed as yellow. All three pixels activated to maximum intensity will produce a white output. Similarly when all three triad pixels are turned off, the result is a blank screen.

Graphics cards have their own dedicated video memory to store screen images and the more you have the better, especially when working with picture imaging. Typically a graphics card with 32MB or 64MB will suit most applications but this should be increased to 128MB or 256MB to cope with computer games for example. A further term used in connection with video memory is FSAA (full screen anti-aliasing). This is a technique to reduce the jagged edges on sloping lines and is achieved by taking the average of two adjacent screen areas and inserting this averaged value between the first two, the step change is now half or what it was previously and therefore less noticeable.


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