Lossy v.s Lossless

A programmer is developing software for a social media platform. The programmer is planning to use compression

when users send attachments to other users. Which of the following is a true statement about the use of

compression?

• Lossless compression of video files will generally save more space than lossy compression of video

  files.

• Lossless compression of an image file will generally result in a file that is equal in size to the original

  file.

• Lossy compression of an image file generally provides a greater reduction in transmission time than

  lossless compression does.

• Sound clips compressed with lossy compression for storage on the platform can be restored to their

  original quality when they are played.

Select the advantages for lossless compression

• Makes the file much smaller

• Will send quicker

• A very simple algorithm

• The quality will not be affected much

Which is a pro of your file being lossy

• quality is loss

• reduce download time

• lower quality

• can't get original back

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Which of the following is an advantage of a lossless compression algorithm over a lossy compression algorithm?

• A lossless compression algorithm can guarantee that compressed information is kept secure, while a

  lossy compression algorithm cannot.

• A lossless compression algorithm can guarantee reconstruction of original data, while a lossy

  compression algorithm cannot.

• A lossless compression algorithm typically allows for faster transmission speeds than does a lossy

  compression algorithm.

• A lossless compression algorithm typically provides a greater reduction in the number of bits stored or

  transmitted than does a lossy compression algorithm.

A user wants to save a data file on an online storage site. The user wants to reduce the size of the file, if possible,

and wants to be able to completely restore the file to its original version. Which of the following actions best

supports the user’s needs?

• Compressing the file using a lossless compression algorithm before uploading it

• Compressing the file using a lossy compression algorithm before uploading it

• Compressing the file using both lossy and lossless compression algorithms before uploading it

• Uploading the original file without using any compression algorithm

Which of the following is a true statement about data compression?

• Data compression is only useful for files being transmitted over the Internet.

• Regardless of the compression technique used, once a data file is compressed, it cannot be restored to its

  original state.

• Sending a compressed version of a file ensures that the contents of the file cannot be intercepted by an

  unauthorized user.

• There are trade-offs involved in choosing a compression technique for storing and transmitting data.

A person wants to transmit an audio file from a device to a second device. Which of the following scenarios best

demonstrates the use of lossless compression of the original file?

• A device compresses the audio file before transmitting it to a second device. The second device restores

  the compressed file to its original version before playing it.

• A device compresses the audio file by removing details that are not easily perceived by the human ear.

  The compressed file is transmitted to a second device, which plays it.

• A device transmits the original audio file to a second device. The second device removes metadata from

  the file before playing it.

• A device transmits the original audio file to a second device. The second device plays the transmitted

  file as is.

In which of the following situations would it be most appropriate to choose lossy compression over lossless

compression?

• Storing digital photographs to be printed and displayed in a large format in an art gallery

• Storing a formatted text document to be restored to its original version for a print publication

• Storing music files on a smartphone in order to maximize the number of songs that can be stored

• Storing a video file on an external device in order to preserve the highest possible video quality

A media librarian at a movie studio is planning to save digital video files for archival purposes. The movie studio

would like to be able to access full-quality videos if they are needed for future projects. Which of the following

actions is LEAST likely to support the studio’s goal?

• Using video file formats that conform to published standards and are supported across many different

  devices

• Using lossy compression software to reduce the size requirements of the data being stored

• Using storage media that can be expanded for additional data capacity

• Using a system that incorporates redundancy to handle disk failure

Digital images are often represented by the red, green, and blue values (an RGB triplet) of each individual pixel in

the image. A photographer is manipulating a digital image and overwriting the original image. Which of the

following describes a lossless transformation of the digital image?

• Compressing the image in a way that may lose information but will suffer only a small loss of image

  quality.

• Creating the gray scale of an image by averaging the amounts of red, green, and blue in each pixel and

  assigning this new value to the corresponding pixel in the new image. The new value of each pixel

  represents a shade of gray, ranging from white to black.

• Creating the negative of an image by creating a new RGB triplet for each pixel in which each value is

  calculated by subtracting the original value from 255. The negative of an image is reversed from the

  original; light areas appear dark, and colors are reversed.

• Modifying part of the image by taking the pixels in one part of the picture and copying them to the

  pixels in another part of the picture.