Gamma Correction Tool
Upload an image and adjust gamma to brighten or darken midtones while keeping black and white points more stable than a simple brightness edit.
Fix image midtones with gamma correction
Midtone control
Gamma correction changes middle tones more than pure black and white, making it useful for flat or overly dark images.
Exposure support
Use a small exposure offset when the whole image needs a minor lift or reduction before gamma correction.
Local browser processing
The correction is applied with canvas in your browser and can be exported as PNG or JPG.
Gamma correction reference
| Gamma value | Visual effect | Use case |
|---|---|---|
| Below 1.0 | Darker midtones | Reduce washed-out images. |
| 1.0 | Neutral | No gamma change. |
| Above 1.0 | Brighter midtones | Reveal detail in dark photos. |
| Extreme values | Strong tonal shift | Use mainly for technical correction or effects. |
How it works
- 1
Upload image
Choose a photo, screenshot, or scanned image.
- 2
Set gamma
Adjust gamma and optional exposure while reviewing the preview.
- 3
Export result
Download the corrected image as PNG or JPG.
When to use gamma correction
Gamma correction is useful when an image feels too dark or too washed out in the midtones. Unlike a simple brightness slider, gamma changes tonal distribution, so it can reveal detail without moving every pixel equally.
For photos, keep changes moderate to avoid unnatural contrast. For screenshots, scans, and technical images, gamma can help improve readability before compression or publishing.
Frequently asked questions
What is gamma correction?
Gamma correction changes how midtones are mapped between dark and bright values.
Does gamma correction change black and white points?
It mostly affects midtones, so black and white endpoints are generally more stable than with simple brightness edits.
What gamma value should I use?
Start near 1.0 and make small adjustments. Values above 1.0 brighten midtones, while values below 1.0 darken them.
Is my image uploaded?
No. The image is processed locally in your browser.
Gamma Correction Tool last reviewed: Aug 1, 2026.