RGB LED color changing

Other Hardware LEDs and Multiplexing
5

In place of :-

digitalWrite(ledRed, 75);
    digitalWrite(ledBlue, 130);
    digitalWrite(ledGreen, 0);

You need :-

analogWrite(ledRed, 75);
    analogWrite(ledBlue, 130);
    analogWrite(ledGreen, 0);

Providing that your ledRed, ledBlue and ledGreen pins are capable of PWM output, which on the Uno pin 3, 5 & 6 are.