how to reduce the brightness of an image?

Question

Sivakumaran Chandrasekaran 2012-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/47841-how-to-reduce-the-brightness-of-an-image

回答： DGM 2022-4-28

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

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Answer 1

Rene 2012-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/47841-how-to-reduce-the-brightness-of-an-image#answer_58459

在 MATLAB Online 中打开

 image = image./3;
 imshow(image,[0 255])

yields a threefold reduction

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Answer 2

Image Analyst 2012-9-11

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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.

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Answer 3

DGM 2022-4-28

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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?