The Four Noble Truths.

Do you know the four noble truths in photography?

1. A camera can only take a picture when there is light. Light must fall on the object, which is then reflected into the camera so that 'image of the object' is ‘seen’ by the camera. When light enters a camera we call it 'an exposure'. So no light means no picture.

2. Too much light reflected from the object will result in a 'too bright' picture. Such picture has many bright and white patches when printed. Such picture has many missing details. This make bad picture. In photography we call this 'overexposed'. So too much light makes bad picture.

3. Likewise too little light makes very dark picture. Such picture when printed has many dark and black patches. Like overexposed picture, this picture also has many missing details. We called this 'underexposed'. So too little light makes bad picture too.

4. Therefore a good photograph must have the correct amount of light entering the camera.

And every photographer will tell you their own version of what constitute a good exposure.

On the other side of the coin.

Sometimes a photographer will deliberately underexpose a picture to give it an edgy mood. This kind of picture is called a 'low key' picture. And on the opposite side a photographer will overexpose a picture for a 'high key' effect. These deliberate actions are used for 'aesthetic' purposes.