SLR 9
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Explain why lossless compression should be used instead of lossy compression to improve the speed of transmission of data between a thin client and the server
• Lossless will not permanently remove data • Lossless can be fully reconstructed • Quality is not lost (give e.g.) • Any loss of text would be unnoticeable/would make it unreadable • Lossless rewrites data in a more efficient format
All videos that are streamed are compressed. Customers have the option to choose from watching the videos with lossy compression or lossless compression. Explain how this choice will impact the customer.
• Lossy permanently removes data • Lossless rewrites original data in more efficient format • Lossless is able to recreate the original file / Lossy is not able to recreate the original file • Lossy reduces quality of videos / Lossless keeps original quality • Lossy file size is smaller than if lossless were used • Lossy: compression ratio may be adjusted depending on bandwidth • Resulting in a noticeable decrease in quality on slower connections. • Lossy: the video will buffer less / quicker to start watching the video / Lossless: the video will buffer more / slower to start watching the video
Shreya is a web developer who creates webpages for a variety of different companies. Photographs on a webpage are usually compressed. State which method of compression is most likely to be used for this purpose. Explain the need to compress photographs in this situation.
Lossy • Reduces the size of the image file • Uses lower bandwidth in transmission • Takes up less storage (on the HTTP server)