What Is File Compression

[Eamonn]

1) What Is File Compression? Why Is It Necessary To Compress Files?
2) describe the differences between lossless and lossy compression and give examples
3) Give examples of lossy and lossless image and video file formats

[ArinN_]

1) What Is File Compression? Why Is It Necessary To Compress Files?
– Compression refers to reducing the original file size.
– Compressed files reduce the time takes to attach, upload and download files. It also helps reduce disk space usage.

2) describe the differences between lossless and lossy compression and give examples
– Lossy compression reduces file size by permanently eliminating certain information. Specifically, it eliminates redundant information, even though the user may not notice it. For example, JPEG is a format that uses lossy compression.
– However, lossless compression retains raster values during compression. At the same time, it still ma ages to reduce file size. For example, LZ77 is a lossless compression file type.

3) Give examples of lossy and lossless image and video file formats
– Lossy: JPEG, MP3
– Lossless: FLAC, ALAC, PNG

[girwan]

1) What Is File Compression? Why Is It Necessary To Compress Files?
File compression reduces the amount of space required for files. This can reduce the traffic or increase space on a server or a hard disk. Also because of its smaller file size it can be sent faster over networks.

2) describe the differences between lossless and lossy compression and give examples.
Lossless compression means that as the file size is compressed, the data quality and quantity remains the same after decompression. Lossy compression permanently removes data.
Eg: A picture stored with lossless compression can have its file size reduced and after decompressing it its resolution will remain the same. But, it is stored with lossy format then its resolution will decrease after its decompressed.

3) Give examples of lossy and lossless image and video file formats.

Lossy: JPEG, GIF’s, MPEG
Loseless: WAV, RAW, PNG

[joshua7]

1) What Is File Compression? Why Is It Necessary To Compress Files?
– It is when the file size is reduced to use less storage than the original file. It is reduced by re-encoding the file data.
2) describe the differences between lossless and lossy compression and give examples
– Lossless does not completely eliminate data, including unnoticeable data, so the file can be restored in the original form. Whereas the lossy compression eliminates data, including unnoticeable data, so the file cannot be restored or rebuilt into it’s original form
3) Give examples of lossy and lossless image and video file formats
Lossy
– JPEG, MP3, MP4
Lossless
– PNG, WAV, BMP

[Irfan]

1) Making the info in a file smaller for transport and storage but still readable for computers. It is necessary because it takes a long time to transfer data that is large over a network unless it is compressed. Which would then allow it to happen with ease.
2) lossless compression means data hasn’t been lost to compress the data. Lossy compression means compression with data lost to achieve the compression. For example .jpeg is lossy because some data that isn’t as important for the overall image is deleted. .png is lossless image compression because info in the image isn’t deleted but changed in a way it takes less space and can be sent to a computer to decode.
3) images
lossy:
JPG
WebP
CPC

lossless:
PNG
LDCT
FLIF

video
lossy:
Motion JPEG
AVC
VC-1

lossless:
FFmpeg
libaom
libopenjpeg

[Shiva Chandnani]

1). File compression is when the size of a file is reduced by re-encoding the file data to use fewer bits of storage than the original. It is necessary to compress files becuase users get to save storage space, have faster transmission time over networks, and many other ways which help saves cost and effort.
2). Lossless compression compresses data but does not remove the quality or main aspects of of the data, however lossy compression does permanently remove data which may lead to a reduction in quality of a photo for example. for example when transferring a mp3 file over a network there may be parts that there is no sound or is repeated, so using lossy compression can reduce the data file and still maintain the quality of the file.
3) GIF and JPEG are lossy while PNG, BMP and Raw are lossless formats for photos. for Audio files, OGG, MP4 and MP3 are lossy formats, while ALAC, FLAC and WAV are all lossless formats.

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