Lossy compression
Posted: Sun Feb 06, 2011 4:12 pm
Hello and sorry if the answer to my question is here somewhere already. I'll just have to say I cant find it.
Jpg compression has two parts. Lossy compression and lossless compression.
Lossy is the kicking out and throwing away some parts of an image that is not easily observable (this according to the ISO subcommittee of experts Joint Photographic Experts Group.)
The lossy compression is permanent.
However after the first compression there is another file compression that loses nothing.
My question is can anyone tell me what percentage of the final file size is due to the lossy compression and how much should be given to the lossless compression.
I have google myself silly trying to resolve this.
Any explanation, or link, or anything will be highly appreciated.
Thanks in advance
Troron
Jpg compression has two parts. Lossy compression and lossless compression.
Lossy is the kicking out and throwing away some parts of an image that is not easily observable (this according to the ISO subcommittee of experts Joint Photographic Experts Group.)
The lossy compression is permanent.
However after the first compression there is another file compression that loses nothing.
My question is can anyone tell me what percentage of the final file size is due to the lossy compression and how much should be given to the lossless compression.
I have google myself silly trying to resolve this.
Any explanation, or link, or anything will be highly appreciated.
Thanks in advance
Troron