Hi Yogambo
Blurring occurs because of the inherent way Bitmap (or
Raster) images are constructed. Essentially, these are nothing more
than a collection of colored dots. The dots are referred to as
PixEls. (a contraction of Picture Elements)
If you shrink a bitmapped image, the computer has to
recalculate what colors the dots are, because essentially some are
being removed. The result of this is that the clarity begins to
suffer.
As for why the text in captions doesn't get scaled down,
there are options that you can set to tell Captivate to leave those
elements alone when resizing. Odds are, this option told Captivate
to leave the Captions as is.
Cheers... Rick