Browser display size vs pixels (or resoution)

Discussion in 'Digital Photography' started by Ron Hardin, Aug 15, 2005.

  1. Ron Hardin

    Ron Hardin Guest

    How do I get a .jpg to display at, say, double size?

    In Irfanview I can set the pixels but sometimes I get a big picture
    and sometimes I get a small one, mysteriously to me, for the
    same .jpg size.

    This pic http://home.att.net/~rhhardin/bike.jpg is 640x496 and
    good-sized but only 87kb

    vs this almost identical one
    http://home.att.net/~rhhardin/bikebackup.jpg which is 532x459 and
    about the same display size but 217 kb

    If I reduce the latter to half size (to get about the same kb) how
    can I get it to display double that size, at the current size?

    I like say 80kb pics, but am not sure how to get them all about
    600x600 display size.

    Firefox and/or Netscape browsers.
     
    Ron Hardin, Aug 15, 2005
    #1
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  2. Ron Hardin

    Paul J Gans Guest

    I assume those sizes are the file sizes stored on your
    computer.

    It turns out that all jpegs are "compressed". The degree
    of compression depends on the amount of detail in the image.
    Thus two TIFF images originally the same size (in pixels) will
    produce different jpeg image sizes on disk.

    For any single given TIFF file the higher the compression
    the smaller the resultant file on the disk.

    When you display the resulting files, the one with the
    higher compression (smaller disk file size) will have less
    detail and be more blocky.

    There ain't no such thing as a free lunch.

    Also, shrinking the actual size of the image prior to
    turning it into a jpeg will decrease the size of the
    resulting file.

    But when you display that smaller image that's what you
    will get, a smaller image. Again, TANSTASFL.

    ---- Paul J. Gans
     
    Paul J Gans, Aug 16, 2005
    #2
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