Gamma Correction Tool
Adjust image midtones with a precise gamma value from 0.20 to 3.00 while preserving the original canvas dimensions.
Upload an image to apply nonlinear gamma correction to its tonal values.
Nonlinear correction
Change midtone brightness differently from a simple uniform brightness offset.
Precise gamma values
Use 0.05 increments across a practical 0.20 to 3.00 range.
Repeatable processing
The tool recalculates from the original pixels each time the value changes.
仕組み
- 1
画像をアップロードする
Choose a browser-supported photo or graphic from your device.
- 2
Adjust the correction
Move the sliders while the output is recalculated from the original pixels.
- 3
PNGをダウンロード
Save the corrected image at its original width and height.
Understanding gamma values
A gamma value of 1.00 leaves pixels unchanged. In this tool, values above 1 brighten midtones and values below 1 darken them. Use small changes and inspect shadow and highlight detail before downloading.
よくある質問
What gamma value keeps the original image?
A value of 1.00 applies no gamma change.
Is gamma the same as brightness?
No. Gamma changes tones nonlinearly, with a stronger effect on midtones.
私の画像はアップロードされていますか?
いいえ、画像はブラウザーに残ります。
Gamma Correction Tool last reviewed: Aug 1, 2026.