Gamma adjusts the image’s tonal distribution (midtones), changing how it appears on screen.
Unlike simply making an image “brighter” or “darker,” gamma mainly shifts the midtones, so it’s commonly used for photo and product-shot correction.
gamma
Description
Sets the gamma correction value. A common range in practice is around 1.8–2.2.
Format
?gamma={value}
Supported values
Range: 1.0 to 3.0
Examples
Request
Result
?gamma=2.2
Midtone tonal correction
Using with other options
gamma works well alongside optimization options such as format, quality, and width.
Because gamma primarily affects midtones rather than overall brightness, it’s especially useful for natural-looking detail adjustments in product photos.
It’s safest to tune it in small steps—e.g., 1.8 → 2.0 → 2.2.
