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TXTEXT Subfunction 4: Mask - random flipped dots
Syntax:
TXTEXT 4 flipratio
Like subfunction 3, TXTEXT subfunction 4 takes one argument, a
flipratio between 0 and 1.0. It first recalls the saved bounds for
the last text written (see section TXTEXT Subfunction 1). Each pixel within these bounds is then flipped
(ie, if white it becomes black, if black it becomes
white(2))
with a probability of fillratio. Note that pixels not flipped are
left as is. This creates an semi-inverted "flicker" effect on the
existing image.
In the following testlist, the word `flick' is written into a picture, and then 50 different pictures are drawn, each with approximately 20% of the pixels within the text bounds flipped:
%X[txtext.xr] %M2%C2 %I[1,1,160,100,flick] %I[50,4,.2] %K[2,51,3] |
Here is the base picture (#1) and three examples of the generated pics (#2-50):
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