0-99 Counter

1. jUST need some help, im building a sensor using photrans, it will only detect black color and disregard whit one's how would i do it?

2. How would i connect the output of the phototrans to convert it to a digital output for my 0-99 counter if it detects a black box and increment by one.

it will only detect black color and disregard whit one's how would i do it?

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White reflects/transmits light ...phototransistor turns on.
Black absorbs/blocks light...phototransistor turns off.

How would i connect the output of the phototrans to convert it to a digital output for my 0-99 counter i

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An op amp comparator circuit would probably work well.