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// Learning Processing
// Daniel Shiffman
// Exercise 17-7: Create a video text mosaic where each letter is colored white,
// but the size of each letter is determined by a pixel's brightness.
// The brighter the pixel, the bigger it is. Here is a little bit of code from the
// inside of the pixel loop (with some blank spots) to get you started.
float b = brightness(video.pixels[i + j*video.width]);
float fontSize = ____ * (_____ / _____);
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