file size vs media size difference after jpg conversion

Discussion in 'Digital Photography' started by nick_harambee, Sep 22, 2007.

  1. nick_harambee macrumors regular

    Joined:
    May 20, 2005
    #1
    hi

    i have tried converting a batch of Jpgs using both GraphicConverter and EasyBatchPhoto so that i can reduce the file size. With both applications i am getting larger file sizes than i have specified for the conversion, and also the 'get info' feature in finder and preview report different file sizes. when i open the converted images in QPict it specifies two sizes, file size (which is equivalent to finder) and Media Size (which is equivalent to Preview). When i try to embed images in Music Files it is the Media Size (Preview) which determines the increase in the music file size. But i wonder why i am getting this difference after conversion, as all of my files pre-conversion show the same file size and media size in QPict. I would like Finder to report the size that is going to count when it comes to embedding.

    i hope this is clear

    nick
     
  2. ChrisA macrumors G4

    Joined:
    Jan 5, 2006
    Location:
    Redondo Beach, California
    #2
    Files are allocated by "blocks". So every file must be at least one block long. Even a text file with just a single letter has a minimum size of one block. So it's file size might be 4K but the file contains only a single character.

    The details depend on the file system and some times on the size of the disk.
     

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