Storing images 0.0 / 5 ? ComputingRepresenting dataGCSEOCR Created by: Katherine_Created on: 07-11-20 14:13 What type of image is used most often and what is it? Bitmap (many used for photos) - they are made up of tiny dots called pixels. 1 of 12 How is the colour of each pixel represented? By a binary code. The number of colours available in an image is related to the number of bits the code has. 2 of 12 How many bits does a black-and-white image need? Needs 1 bit - 0 for black, 1 for white 3 of 12 How many colours can a two bit image have? A two bit image can have a maximum of four colours. The colours are represented by the binary values - 00, 01, 10, 11 4 of 12 How can you make a greater range of shades/colours? Increasing the number of bits. 5 of 12 What is the colour depth? The number of bits used for each pixel. 6 of 12 What is the formula for working out the amount of colours that can be used? total number of colours = 2 (n) () - to the power of n = number of bits per pixel 7 of 12 Most devices use which colour depth? 24-bit colour depth. 8 bits are used to indicate the levels of red, green and blue needed for each pixel. 8 of 12 What is image resolution? It's the number of pixels in an image. The higher the resolution, the better quality image. 9 of 12 What is the formula to work how many bits an image will take up? file size (in bits) = image resolution x colour depth = width x height x colour depth 10 of 12 Using a greater image resolution means what? The more bits in the image. 11 of 12 Having a high-quality image does what to the file size? Increases the size. 12 of 12
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