Photo Booth does not shine and does not count backwards when taking photos

The Mac party who likes to take a camera should be familiar with the built-in software "Photo Booth", right? It comes with Mac OS, can help us take pictures, also can use it with special effects "fool" us. But friends know that Photo booth will have the Countdown "3, 2, 1" before taking the picture, and will light the entire screen as a flash to illuminate the face. But if we are in a room with a good light, we do not need the "flash" to make trouble. (That's the problem I've been having.) Open Photo booth in a room with good lighting and a warm-toned light. The flash made my face blue. What should I do? It's easy to use two keys to solve this problem. To do this: when you don't need a flash, hold down the SHIFT key while you click the "Take" button. When the countdown is not needed, hold down the option key. Of course, if you don't need both, hold on.