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Size formula resolution

we've covered this before in fact we covered it last year quite early on which is one of the reasons why I want to revise it with you because it comes under as well as your previous topics on storing and retrieving in a prelim course it also comes under multimedia which is one of the big topics that's being assessed in this upcoming exam okay so I figured I better refresh your memory because it's been a while I do note by the way that this is calculating it does not say evaluating so that's why in the actual HSC not only do you not need a calculator but you actually cannot bring a calculator in the point is not to get a final number at the end that it's you know this many megabytes or something like that but just to show the purchase that you go through in actually working out okay wall how big is something okay now just for the sake of it I am going to work these numbers out even though you don't have to do just so that you can see like okay are we in the right ballpark do these numbers make sense at all okay so we'll get onto that in a minute now under bounce ability there are three kinds of far type whose size we're interested in calculating what are the three okay yeah and image and audio okay now I'll take it in reverse order will go from simplest to most contacts remember by the way that all of this is considering it as uncompressed because there are so many different varieties of compression out there and excuse me compression works so differently based on the kind of data you have in a specific photo you can't reliably know what what something's image size or audio size or video size will be after compression it's worth 30 that for things like set mp3 that's an audio type of compression that it's generally speaking about a one to ten ratio so if you hadn't say a forty big wav file that'll usually come out to be about a four Meg mp3 file but that kind of idea like estimating compression thing doesn't really come under this heading this is just working out precise you know for a bitmap image or for a WAV file or for an uncompressed video okay so the numbers tend to be pretty huge alright let's start with images now let's see how much of this you can remember there are only really two things you need to know two quantities about an image that'll tell you what its file size would be this is just uncompressed right because they don't remember what are the two things you need to know yet okay number one bit depth so that's a way of saying how many colors does something have right because each individual pixel less you will have a set number of bits assigned...