LZW compression works by trying to reduce the number of colours that are displayed whilst ensuring the image can still be viewed and understood. Those blocks can then be further sub divided and the image data that is stored within a GIF file uses LZW (Lempel Zev Welch) compression. For example, one block will contain the description information whilst another will focus on the image data. These blocks are all different and are designed to do different things. GIF is unlike other image formats in that it is made up of data packets known as blocks which means they’re read as a continuous stream of data. Originally created by CompuServe it was designed to display an image in a way that was memory and storage efficient as the file itself was compressed but better formats came along, namely JPGs and PNGs, and this made the GIF format almost defunct through the 90s. As well as this, popular websites like Giphy allows people to find GIFs easily and so have contributed to its recent popularity. The GIF file was created in 1987 and its popularity has changed decade to decade with it currently enjoying something of a renaissance as social media and SMS platforms have got in built GIF capability that allows users to share short video clips. The GIF also goes by the name of Graphics Interchange Format and its pronunciation is often up for debate with many stating the correct way to pronounce it is with a soft ‘G’.
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The increasing popularity of MP4 files has seen the creation of a number of MP4 players which are designed to play MP4 files. The reason for this is because the audio compression is handled differently from the video compression with the video compression being done using MPEG-4 whilst the audio compression uses AAC which actually helps to improve the audio quality. In other words, they were small in size but still retained the quality of the audio and video elements. MP4 files were the file type of choice for Apple’s iTunes mainly because of how efficient they are.
MP4 files are clever in their design in that they combine compression technologies which means they tend to be small in size which is another reason for their popularity.Īn MP4 file is often known as a container format because of the way it is structured. As well as iTunes causing a major increase in use, the Internet has also been behind its increased popularity as when a user downloads a video on the Internet it tends to be in the MP4 format. This is because it is the standard format for the majority of iTunes downloads. When iTunes launched in 2001 the MP4 file format saw a major boom in use. An MP4 file is often called an MPEG4 file and it is used to store video and/or audio data.
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