3.03 Representing Images

3.3 Representing Images Curriculum Page

Portfolio Reflection Questions:

1. Decode this message by converting it from binary to ASCII: 1000001 1110000 1110000 0100000 1001001 1101110 1110110 1100101 1101110 1110100 1101111 1110010 0100000 1010010 1001111 1000011 1001011 1010011 0100001 You can use this chart to help you: ASCII Conversion Chart
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2. Describe what it means to say that JPEG is a lossy compression technique and whether or not it affects the quality of camera pictures.
   • JPEG is a lossy compression technique due to the fact that the mathematical approximation of the discrete cosine transformation isn't exact. So, when the number of pixels and their numbers are reduced through the compression, the smaller number can't go back to the larger number which means that some information was lost. As a result, the quality of camera pictures is affected, however usually at a level that the human eye can not detect.
3. Give a specific example of a binary sequence that can represent more than one type of data -- e.g., a number, a color, a character -- and describe how to interpret its different values.
   • 01000001 can be the letter "A," the color magenta, and the number 65. The computer interprets this binary number based on how it's being used and on what software. For example, the computer would know to read the binary number as a color when it sees it's a JPEG.

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