About Adjust Gamma
Gamma correction is a non-linear brightness adjustment that mostly affects midtones. This tool builds a 256-entry lookup table using output = 255 x (input / 255) ^ (1 / gamma) and applies it to the red, green, and blue channels. Values above 1 brighten midtones, values below 1 darken them, and pure black and pure white do not move. The range is 0.2 to 3.
How to use Adjust Gamma
- Choose an image, or drag it onto the upload area. The file is read by your browser and is not uploaded.
- Set "Gamma". The preview updates as you change them.
- Check the preview, then press "Download result" to save the file.
Questions about Adjust Gamma
What is the difference between gamma and brightness?
Brightness scales every tone, so highlights can clip to white. Gamma bends the curve between fixed black and white end points, lifting or lowering midtones and shadows while the brightest and darkest pixels stay where they are.
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