![]() ![]() JPEG is a good compression format for high-quality images and images where quality is unimportant (e.g. ![]() Allows the user to select an appropriate level of compression.Number of channels is typically 1 (mono) or 2 (stereo), although it could be more for a surround sound file.Ĭalculate the file size of a mono voice recording captured at 24KHz with a sample depth of 8 bits, lasting for 15 seconds.ģ60000 / 1024 = 351.56 KB Graphic Formats.Length of sound should always be converted into seconds if necessary.Sample depth is the number of bits that were used to store each sample.Sample frequency is the number of times per second that a sample of the original sound was taken.ġ Hz = once every second.Sample frequency (Hz) x sample depth (bits) x length (seconds) x number of channels ![]() To calculate the file size (in bits) of an uncompressed audio file the basic formula is: A full compression MP3 compresses data to around 10% of the original size, with relatively little loss of quality.User can choose the level of compression.When two similar sounds (but different volume) occur at the same time, removing the quieter one.Removes the very high or low frequencies that humans cannot hear.Lossy compression reduces file sizes by removing some data.Lossless compression reduces file sizes without removing any data.Individual media elements audio, graphics and video within the webpage could also be compressed in order to reduce the size further. The browser will decompress the page before displaying it. Small file sizes can be transmitted and processed more quickly.įor example, a whole webpage can be compressed, reducing the amount of data which has to be sent to the client computer and therefore reducing the load time.Appropriate use of compression can reduce file sizes.Need for compression – reduces the file size so that the web page loads more quickly. ![]() Vector graphics are scalable when you resize them, they do not lose quality. Therefore the file size of a vector graphic is often very small. It is possible to edit each object separately, for example, change the shape, colour, size and position.Įven if an object in a vector graphic is quite large, it doesn’t need a lot of computer memory. In that case there are 72 x 1 x 72 x 1 = 5184 pixelsīitmap with a resolution of 600×600 pixels in 8 bit colour.Ĭalculate the number of pixels in 4 inch by 5 inch photograph scanned which has a resolution of 600 dots per inch. This is enlarged but is 1 inch by 1 inch. Number of pixels = Horizontal Pixels x Vertical Pixelsįile Size = Number of pixels x colour depth (in bits) Vertical Pixels = image height x resolution(DPI) Horizontal Pixels = image width x resolution(DPI)
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