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Gamma

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Adjust image gamma online

Apply gamma correction to photos online: adjust image gamma from 0.1 to 5.0 for midtone fixes. Live preview, PNG download in your browser.

What is gamma correction?

Adjust image gamma to change midtone brightness with a power-law curve—not a flat linear shift. Gamma correction at 1.0 leaves the file unchanged; values above 1.0 brighten shadows and mids, while values below 1.0 add contrast to washed shots. The same workflow covers image gamma correction, gamma adjustment, gamma picture edits, and gamma transformation via a 256-entry lookup table. Processing runs entirely in your browser.

Gamma correction controls

Power-law gamma adjustment for image gamma—midtone fixes without linear brightness clipping.

  1. Gamma correction slider 0.1 to 5.0: Values above 1.0 lift midtones; below 1.0 add punch to flat exposures—full range for precise gamma adjustment.
  2. Lookup table gamma transformation: Power-law gamma transformation on RGB via a 256-entry LUT—faster than manual curves for quick fixes.
  3. Live image gamma correction preview: Side-by-side gamma image output vs original as you drag—download when it looks right.
  4. PNG download: Save adjusted image as gamma-adjusted.png.
  5. Multiple formats: Upload PNG, JPEG, WebP, or GIF files.

How to adjust image gamma

Steps for gamma correction online—same flow for gamma picture and pic gamma edits.

  1. Upload the image: Drop or click in the input panel (15 MB max).
  2. Adjust gamma: Move the slider: above 1.0 to brighten underexposed shadows, below 1.0 to darken washed highlights.
  3. Preview the result: Compare original and adjusted side by side.
  4. Download PNG: Save when the preview matches your goal.

Tips for gamma adjustments

Get better results when adjusting gamma.

  1. Start with small changes: Gamma 0.8–1.3 covers most common corrections.
  2. Use for midtone control: Gamma is ideal for adjusting image tone without clipping.
  3. Combine with other tools: Use brightness/contrast after gamma for fine-tuning.
  4. Fix underexposed shots: Gamma 1.5–2.0 can recover detail in dark photos.
  5. Add contrast to flat images: Gamma 0.6–0.8 adds punch to washed-out photos.
  6. Use PNG for transparency: Alpha channels are preserved when adjusting gamma.

When to use gamma correction

Typical jobs for gamma image fixes and gamma picture recovery.

  1. Underexposed photos: Recover shadow detail by increasing gamma above 1.0.
  2. Overexposed photos: Add contrast to flat, washed-out images by decreasing gamma.
  3. Monitor calibration: Correct images for different display gamma settings.
  4. Scanned documents: Improve readability of faded or dark scans.
  5. Video frame correction: Fix individual frames with exposure issues.
  6. Print preparation: Adjust gamma for accurate print reproduction.

Why use gamma correction

Benefits of nonlinear brightness adjustment.

  1. Natural results: Midtone emphasis produces more pleasing adjustments than linear brightness.
  2. Preserve extremes: Shadows and highlights are less affected, preventing clipping.
  3. Private: Images stay on your device—no server upload.
  4. Instant preview: See changes in real time as you adjust.
  5. No install: Works in any modern browser.
  6. Free: Unlimited adjustments and downloads.

Technical details

How gamma correction and gamma transformation work.

  1. Algorithm: Apply power-law transformation: output = 255 * (input/255)^(1/gamma).
  2. Lookup table: Precompute 256-entry LUT for fast per-pixel transformation.
  3. Color channels: Apply gamma equally to R, G, B channels; alpha unchanged.
  4. Rendering: Canvas 2D getImageData / putImageData.
  5. Input limits: 15 MB; longest edge 8192 px.
  6. Browser support: Chromium, Firefox, Safari with Canvas 2D.

Frequently Asked Questions

Have questions? We have answers.

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