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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.
  • 01

    Start with small changes

    Gamma 0.8–1.3 covers most common corrections.

  • 02

    Use for midtone control

    Gamma is ideal for adjusting image tone without clipping.

  • 03

    Combine with other tools

    Use brightness/contrast after gamma for fine-tuning.

  • 04

    Fix underexposed shots

    Gamma 1.5–2.0 can recover detail in dark photos.

  • 05

    Add contrast to flat images

    Gamma 0.6–0.8 adds punch to washed-out photos.

  • 06

    Use PNG for transparency

    Alpha channels are preserved when adjusting gamma.

Gamma Correction Tools Compared — Which One Fits Your Workflow

How this free gamma correction tool stacks up against other popular online options for adjusting image midtone brightness.

  1. Gamma.ImageOnline.co

    Feature-rich gamma tool with companion brightness and contrast sliders plus SVG hardware-accelerated live preview. Zero-lag rendering is impressive. However, the combination slider UI can overwhelm users who only need gamma correction, and it uses LUT processing for downloads vs. real-time canvas editing.

  2. SynthQuery.com

    Technical gamma corrector with tonal-mapping curve visualization and one-click presets (0.5, 0.8, 1.0, 1.5, sRGB 2.2, 2.6). Supports JPG/PNG/WebP/BMP/TIFF with drag-compare. The curve plot adds helpful visual learning for gamma math but may intimidate non-technical users.

  3. Elysia Tools

    Straightforward gamma correction with output format choice (JPEG/PNG/WebP) and quality slider. 10 MB upload limit is lower than most competitors. Clean single-purpose interface but limited to 10 MB files with fewer supported input formats.

  4. PineTools.com

    Simple gamma slider with upload-and-apply workflow. Works for basic adjustments but requires clicking an "Adjust" button instead of real-time slider feedback, and lacks side-by-side comparison or sample images.

  5. Adjust Image Gamma

    Single focused slider: gamma from 0.1 to 5.0 with power-law LUT transformation. Real-time preview with side-by-side comparison. Values above 1.0 brighten underexposed shadows; below 1.0 add contrast to flat highlights. All processing in your browser—no uploads, no watermarks, no signup.

When to use gamma correction

Typical jobs for gamma image fixes and gamma picture recovery.

  • Underexposed photos

    Recover shadow detail by increasing gamma above 1.0.

  • Overexposed photos

    Add contrast to flat, washed-out images by decreasing gamma.

  • Monitor calibration

    Correct images for different display gamma settings.

  • Scanned documents

    Improve readability of faded or dark scans.

  • Video frame correction

    Fix individual frames with exposure issues.

  • Print preparation

    Adjust gamma for accurate print reproduction.

Why use gamma correction

Benefits of nonlinear brightness adjustment.

  • Natural results

    Midtone emphasis produces more pleasing adjustments than linear brightness.

  • Preserve extremes

    Shadows and highlights are less affected, preventing clipping.

  • Private

    Images stay on your device—no server upload.

  • Instant preview

    See changes in real time as you adjust.

  • No install

    Works in any modern browser.

  • Free

    Unlimited adjustments and downloads.

Technical details

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

Sources & References

Authoritative references on gamma correction, display standards, and browser-based image processing technology.
  • “Gamma correction is a value used to correct the luminance of an image, often to compensate for non-linear characteristics of display devices.”
    — Wikipedia — Gamma correction

    Gamma correction: This article explains the power-law transformation that this gamma adjustment tool applies — the same mathematical curve used in display calibration and photo editing. en.wikipedia.org/wiki/Gamma_correction

  • “The Canvas API provides a means for drawing graphics via JavaScript and the HTML canvas element.”
    — MDN Web Docs — Canvas API

    Canvas API (client-side gamma processing): This tool uses Canvas 2D getImageData and putImageData combined with a precomputed 256-entry lookup table to apply the power-law gamma transformation efficiently. developer.mozilla.org/en-US/docs/Web/API/Canvas_API

  • “PNG supports lossless data compression, making it useful for storing graphics that need to be edited repeatedly without losing quality.”
    — W3C — PNG Specification (overview)

    PNG image format: PNG is the output format — its lossless compression preserves gamma-adjusted pixel values without introducing banding or artifacts. w3.org/TR/PNG/

  • “The sRGB reference viewing environment corresponds to a ambient illuminance level of 64 lx.”
    — Wikipedia — sRGB

    sRGB color space and gamma: The sRGB standard defines a gamma curve (~2.2) that most web images use. This tool lets you override that gamma for creative or corrective purposes. en.wikipedia.org/wiki/SRGB

Frequently Asked Questions

Quick answers about this tool—open a question to read more.