Upload up to 20 images. - Compression: Same Data, Fewer Bits. Explain why the optimal amount of compression is impossible or “hard” to identify. The groups with the best compression percentages may be asked to share their strategy with the class. Let's look at an example of a text message that's been compressed in a clever way. There are no file size limits, allowing you to create large compressed files. Gzip Compress/Decompress. (count bytes in original vs. total bytes in compressed version), Experiment with zip using text files with different contents. Simple, Effective and Free. It was intended to simply reference the existing activity guide with an option for how to use it. Compression can be achieved in a variety of methods including looking for patterns and substituting symbols for the larger patterns of data. We do want students to see, however, that there is no single correct way to compress text using the method we use in this lesson because a) there is no known algorithm for finding an optimal solution, and b) we don’t even know a way to verify whether a given solution is optimal. There are benefits and drawbacks to each. Trade your heuristics with another group. Explain why the optimal amount of compression is impossible or “hard” to identify. Please make a copy of any documents you plan to share with students. One reason is that storage space is limited and you'd always prefer to use fewer bits if you could. You might find students are more receptive to some of the information in the video if they have tried to use the tool first. Compression is a method or protocol for using fewer bits to represent the original information. List as many as you can. Record your heuristic as a list of steps that someone else unfamiliar with the problem could follow and still end up with decent compression. Try to develop a general strategy that will lead to a good compression. This online image optimizer uses a smart combination of the best optimization and lossy compression algorithms to shrink JPEG and PNG images to the minimum possible size while keeping the required level of quality. Are they clear and specific enough that you always know what to do? Students invent their own way here. Select up to 20 .jpg or .jpeg images from you device. (i.e. Why is this important? Give students a minute to write, and to share with a neighbor? It allows for optimization of limited resources. This is an example of an algorithm that cannot run in a “reasonable amount of time” - one of the CSP learning objectives. Are the results for small files as good as for large files? Ubuntu, Mint, Debian), Android, ChromeOS (Chromebook), iOS (iPhone, iPad & iPod Touch). In computer science there is a word for strategies to use when you're not sure what the exact or best solution to a problem is. Today: 146 files, 1.47GB | Total: 38,360 files, 306.47GB | From October 2019, © 2019-2020 DocuCompress | It’s imprecise, but still OK. It runs locally as a browser app, thus making it much quicker than other similar zip and unzip online tools. Differentiation and other adjustments to this lesson. There is no way to prove it or derive it beyond trying all possibilities by brute force. Compress JPEG images and photos for displaying on web pages, sharing on social networks or sending by email. Terminology: Verify students know or use an *exit ticket on this vocabulary: There is a compression algorithm called LZW compression upon which the common “zip” utility is based. A general "hand-wavy" understanding is all that's needed from this lesson.

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