1 sans vs. serif
2 upper + lower case converter
3 enhance, blur, noise filters
Filters convert to upper or lower case.
An intensity value from 0 to 1.0 designates which
letters are converted, based on the letter's position
in the alphabet. A value of 0.5 means letters in
the first half of the alphabet will be converted.
The noise filter performs a letter substitution from a table,
changing the letter to one of three letters or combinations of letters
which sound similar to the original letter. The intensity determines
which letters are converted, depending on how frequently the letter
appears in the written English language. An intensity of 0.5 changes
the letters zxqkjvbgwyfpm, the half of the alphabet which is less
The blur filter causes each line of the text area to be doubled,
as if your eyes are blurred and you're seeing double. The blur intensity
determines how far apart the text string "images" are set -- an intensity of zero
causes the two text images to be interwoven letter by letter,
while an intensity of 1.0 causes the two text images to occur side by side.
Any value in between causes some of the end of the first image to
be interspersed with characters from the beginning of the second image.
The enhance filter tries to enhance the readibility by lengthening
the ascenders and descenders of letters -- placing other characters below
and above the letters with jutting parts. Intensity does not affect