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•24-bit images are preferable to 8-bit images because each pixel has
more bits within which to hide a message.
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•In a 24-bit image, each pixel is represented by 3 bytes, one byte each
for Red, Green, and Blue, which allows the color values to be stored directly
in the image and does not require the use of a color-table.
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•Slightly manipulating color values stored this way will result in a
color who’s value is extremely close to the original.
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•A 24-bit 1024x768 image provides over 2 million pixels within which to
hide a message, each pixel being three bytes each.
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•Obviously, a file with the characteristics that we’re talking about
will be a fairly large image and is still rather uncommon on the Internet.
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•Images this large may stand out or attract attention unless
compressed.
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•Compression may also be required to make an image this large feasible
to transfer on low-speed connections or networks.
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24-bit images inherently provide more space for embedding a message than an 8-bit image