Chapter 6 - Sec 3

all the data bits from the original file are reconstructed when the file is again uncompressed. This is particularly important for files where loss of any data would be disastrous.

• Lossy compressions

• Lossless compressions

the file compression algorithm eliminates unnecessary bits of data as seen in MP3 and jpeg formats.

It is impossible to get the original file back once it is compressed.

• Lossy compressions

• Lossless compressions

Refers to the compression when some of the data from the original file is lost

• lossless

• 300 dpi

• lossy

• cmyk

Which is a pro of your file being lossy

• quality is loss

• reduce download time

• lower quality

• can't get original back

Which is a pro of your file being lossy

• can't get original back

• easy uploading

• lower quality

• quality loss

Which is a con of your file being lossy

• reduced file size

• reduced download size

• quality loss

• easy uploading

Which is a con of your file being lossy

• easy uploading

• reduced file size

• reduced downloading

• can't get original back

Lossy =

• not losing

• getting all quality of an image

• loses some quality

• keeps all image quality

Refers to compression when the image is reduced without any quality loss

• Lossy

• RGB

• 72 PPI

• Lossless

Which is a pro of Lossless

• larger files vs. lossy files

• low low low quality

• its become pixelated

• No loss of quality when compressed