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  Topic: Wildlife, What's in your back yard?< Next Oldest | Next Newest >  
Cubist



Posts: 347
Joined: Oct. 2007

(Permalink) Posted: Mar. 20 2012,02:07   

Just in case someone is curious: The JPE file format divides an image up into small (8x8 pixel) chunks, and it uses a Fourier Transform-type compression algorithm on each individual chunk. This algorithm is intrinsically lossy, which means it's explicitly and deliberately throwing away some of the image's information; when you save an image as JPEG and your machine asks you what "quality" level you want, it's really asking you how much of the image-info you want to throw away. At really low "quality" levels, the individual 8x8 image-chunks become increasingly obvious.

  
  2203 replies since Jan. 24 2008,14:26 < Next Oldest | Next Newest >  

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