uniti code where each number represents character can be used to convert text into binary one code we can use for this is called ascii the ascii code takes each character on the keyboard and assigns it binary number for examplethe letter 'ahas the binary number (this is the denary number the letter 'bhas the binary number (this is the denary number the letter 'chas the binary number (this is the denary number text characters start at denary number in the ascii codebut this covers special characters including punctuationthe return key and control characters as well as the number keyscapital letters and lower case letters ascii code can only store characterswhich is enough for most words in english but not enough for other languages if you want to use accents in european languages or larger alphabets such as cyrillic (the russian alphabetand chinese mandarin then more characters are needed therefore another codecalled unicodewas created this meant that computers could be used by people using different languages representing images images also need to be converted into binary in order for computer to process them so that they can be seen on our screen digital images are made up of pixels each pixel in an image is made up of binary numbers if we say that is black (or onand is white (or off)then simple black and white picture can be created using binary to create the picturea grid can be set out and the squares coloured ( black and whitebut before the grid can be createdthe size of the grid needs be known this data is called metadata and computers need metadata to know the size of an image if the metadata for the image to be created is this means the picture will be pixels across and pixels down this example shows an image created in this way department of csevishnu institute of technology