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How to increase brightness such as photoshap?

The most common way to increase the brightness add the brightness value with each pixels in 3 channels then we can control the color saturation.However, the conventional method is different from Photoshop. What do you think?

thanks

How to increase brightness such as photoshap?photoshop?

The most common way to increase the brightness add the brightness value with each pixels in 3 channels then we can control the color saturation.However, the conventional method is different from Photoshop. What do you think?

thanks