by Tomás Orlando BAR

Lossless and lossy compression

tomasob — 2015-09-24 17:39:29 UTC

lossless compression

tomasob — 2015-09-24 17:40:12 UTC

The basic concept of the lossless compression algorithm, as the name suggest, is to make a file as small as possible, but without losing any of the original information. We can use this compression method to save text and images, for example. basically, as said before you can use this method when you dont want to lose original information

lossy compression

tomasob — 2015-09-24 17:54:13 UTC

The lossy compression algorithm allows the user to compress information, but you lose information in the process. This method is usually used when compression videos or audio, because most of the information that you lose when compressing is useless (because the human ear is unable to listen to this sort of sounds)

tomasob — 2015-09-24 18:12:06 UTC

tomasob — 2015-09-30 15:36:29 UTC

example of lossy compression

tomasob — 2015-09-30 15:42:33 UTC

In this image we can clearly see how does this algorithm work: as ew can see in the image, the bigger the compression rate is, the lower is the size of the image, but it also affects the image by distoring the image and making it blurry.

2015-10-01 17:57:44 UTC

With help of Anselmo Benassi

Some extra info!

2015-10-01 20:31:01 UTC

The "compression ratio" makes reference to the "%" of a file that can be compressed. For example, a compression ratio on 80% means a file of 100 units will be compresses to 20 units. However a file that was already compressed can not be compresses again, until you are using a lossy compressor, but you might loos important informaton and compressing to much will result in loosing the message of the file.

2015-10-01 20:35:15 UTC

Compression ratio cant be 100% (this would be deleating the file) so there is a clear limit to compression ratio.

Lossless compression

2015-10-01 21:38:36 UTC

Lossy compression

2015-10-01 21:38:57 UTC