how to reduce the brightness of an image?

In MATLAB there are direct commands to enhance the brightness. I need to reduce it. How to achieve it.

Answer 1

[Rene]

 image = image./3;

 imshow(image,[0 255])

yields a threefold reduction

Answer 2

[Image Analyst]

There are several ways, such as you can divide the image by a factor, you can subtract a number from it, or you can convert from RGB color space to HSV colorspace, reduce the intensity of the v channel (for example by subtracting or dividing) and then convert back to RGB color space.

Answer 3

[DGM]

There are many different ways, using both simplistic direct methods and purpose-built tools. The answers in this related question cover several of the ways and should apply directly to this question as well.

How to increase the brightness of an image?