Short answer:
1. What is metadata? Give an example of how a piece of metadata could be used to increase the usefulness of an image or document.
Metadata is all the information such as last modified, the creation date, etc that isn't initially shown, but can be accessed.
2. What is a model?
A model is a way that can simulate the original version of something.
3. What's the difference between a raster image and an ASCII representation of a text document?
The difference between a raster image and an ASCII representation of a text document is that a raster image is a grid that can hold (usually) 8 bits or a byte. An ASCII representation is not able to be visualized without some work.
4. What are filename extensions? What are they used for?
Filename extensions indicate the way in which they were compressed or stored. JPEG is used for photos, PNG is used audio files, etc.
5. What is lossless representation? What is lossy representation? What are the trade-offs in using each representation?
Lossless representation is a type of compression that does not lose any of the original code. It recognizes redundancies and doesn't fully represent all of them. Lossy representation loses some of the original code, however it is usually very minimal and unnoticeable .
6. What is steganography and what is it used for? Describe in your own words the steganography algorithm used in the activity.
Steganography is the art of hiding messages in seemingly normal code.
7. What would you have to do to delete a document from your computer so that it could not possibly be read by anyone else?
You would have to complete erase all the path files and traces of the file in your computer.
8. What is free and open source software? Provide an example.
Free and open software is software that can be used by the public and without cost. Microsoft Word is an example.
Free Response:
1. How has retouching become a controversial issue? Give an example.
Retouching has become a controversial issue because it doctors the orginal image without being very recognizable-which can be misleading.
2. Would you rather own a camera (or camera phone) with a higher number of megapixels or lower? Explain.
Higher, because the quality would be better.
3. Other than digital images, what might be an example of a computer model? Explain your answer based on the definition of a model.
An animation could be an example of a computer model.
4. The code that implements App Inventor is open source and its impact on education is obvious. Find another example of open source software and describe its positive impact on education, business or society.
Google Drive or Google Classroom is an example of open source software that has aided in the field of education,