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Question on Compression Methods

Discussion in 'Computing and ICT' started by Mr_G_ICT, Jan 4, 2012.

  1. Mr_G_ICT

    Mr_G_ICT New commenter

    Ok, just doing my lesson on Lossy Vs Lossless and i've got some great resources from CSUnplugged and CS inside.

    However, here is my question: I know that MP£/JPG/PDF files are encoded using a lossy compressioin, But are all documents that are not lossy compressed squished in lossless format when saved.

    E.g. I save a word document, does it automatically compress it?

    It seems to make sense to do so, but i don't know the answer. I can see this being a question my Year 10's will ask
     
  2. Mr_G_ICT

    Mr_G_ICT New commenter

    Ok, just doing my lesson on Lossy Vs Lossless and i've got some great resources from CSUnplugged and CS inside.

    However, here is my question: I know that MP£/JPG/PDF files are encoded using a lossy compressioin, But are all documents that are not lossy compressed squished in lossless format when saved.

    E.g. I save a word document, does it automatically compress it?

    It seems to make sense to do so, but i don't know the answer. I can see this being a question my Year 10's will ask
     
  3. .docx Word files are actually .zip files so they are compressed using lossless compression. However, images within the document may be a mixture of lossy (.jpg) and lossless (.png).
     
  4. Mr_G_ICT

    Mr_G_ICT New commenter

    brill, thanks.

    that's quite interesting actually. think it'll go on my twitter wall.

    Will need to COMPRESS it first though (BOM BOM!)*






    *yes i am that lame
     

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