Lossy Compression and File Formats

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Presentation transcript:

Lossy Compression and File Formats Lesson 1-16 AP Computer Science Principles

Journal GIF and PNG are both lossless image compression formats. Which one is better?

Rest of Today Download the Word file U1L16Worksheet- BlownToBits from the Homework Section for today. Follow the instructions, complete the questions and turn the sheet in at the end of class. If you don’t complete it, it’s homework!

Ghosts in the Machine Read Blown to Bits (www.bitsbook.com), Chapter 3, Ghosts in the Machine, pp. 88-90 (Reducing Data, Sometimes Without Losing Information) http://www.bitsbook.com/wp- content/uploads/2008/12/chapter3.pdf Answer the following question: Do you think the need for file compression will always be needed, considering the advances in data storage, the speed of computers, and speed of the Internet?

Ghosts in the Machine Read Blown to Bits (www.bitsbook.com), Chapter 3, Ghosts in the Machine, pp. 90-94 (Technological Birth and Death), http://www.bitsbook.com/wp- content/uploads/2008/12/chapter3.pdf Answer the following questions: Data formats are constantly changing. What challenges does this present for historians? For a given document, movie, or audio file, what are all the component pieces that need to be preserved along with it? There is concern about Microsoft’s de-facto “.doc” format. Do similar concerns exist for cloud services such as Cloud Data formats and Cloud APIs? What are some such APIs and what will the dangers be if those de-facto standards are adopted?