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Does NTFS compression affects quality of image files(jpeg)?

Discussion in 'Windows XP' started by ghanz, 2004/08/21.

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  1. 2004/08/21
    ghanz

    ghanz Inactive Thread Starter

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    In Windows XP that is.. I regreted using ntfs compression when i was running out of diskspace. :(
     
    ghanz,
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  2. 2004/08/22
    PeteC

    PeteC SuperGeek Staff

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    ghanz - Welcome to the Board :)

    That is a difficult question to answer without knowing exactly what is compressed by NTFS compression and how :D

    As you are clearly aware further compressing of jpeg files results in a loss of quality as does a high degree of initial compression.

    The question - to which I cannot readily find an answer, is - does NTFS compression further compress files which are already compressed? Maybe, maybe not.

    As an experiment take a jpeg file and zip it - does the file size reduce? If it does then further compression has been applied and it would be reasonable to assume that the same would occur with NTFS compression. If possible look at the file size of an NTFS compressed jpeg vs the uncompressed version.

    According to this Knowledge Base Article it is possible to compress folders without compressing the contents.
     
    PeteC,
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  4. 2004/08/22
    JoeHobart

    JoeHobart Inactive Alumni

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    NTFS compression has *NO* effect on the actual contents of files, be they JPG, DOC, PDF or EXE. It uses a lossless compression scheme. Think about it for a sec.. Imagine you are using Microsoft Money to track your checking account. You install it on NTFS, and your account balance goes down? :D

    Here is a great article with some more detail on how that works http://msdn.microsoft.com/library/d...o/base/file_compression_and_decompression.asp

    If i may inquire, what is prompting this question. Some other factor is at work here, we can probably help you sort it out. My first guess is that you went from 32 bit color display to 16-bit. JPEGs are 24 bit color, so if you are only running 16 bit, you may notice some palette inconsistancies.

    Post back on what you did, and what you experienced.
     
    JoeHobart,
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  5. 2004/08/28
    ghanz

    ghanz Inactive Thread Starter

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    Thanks for the replies guys, the Knowledge Base article was very informative on ntfs compression. I was just afraid that I would lost image quality on image files with ntfs compression & upon uncompressing.
    Anyway using ntfs compression on images save very little space, as probably only some text attributes are compressed.
    As for what is prompting this question, I guess that it's a psychological effect on me that my image files seems to look a bit worse after compression. :rolleyes:
     
    Last edited: 2004/08/28
    ghanz,
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