Does Gamma Image upload my file or text to Tool-You servers?

No. Gamma Image runs in this browser tab. Files stay on the device. Limit note: Gamma 0.4–3 per channel. PNG. First GIF frame only. Max 20 MB.

Should I use Adjust Image Brightness instead of Gamma Image?

Use Gamma Image when you need Apply a gamma curve to RGB. Use Adjust Image Brightness when you need Brighten or darken a photo locally. They share a category (Images) but not the same job.

Gamma Image

Apply a gamma curve to RGB.

Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only.

What Gamma Image does

Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only.

The interactive controls for Gamma Image load after this article so crawlers still read the instructions. Path /gamma-image is the canonical address. Work happens on this device; Tool-You does not take a copy of the file or pasted text for Gamma Image.

How to use Gamma Image

Stay on this Gamma Image page (/gamma-image). Do not switch to Adjust Image Brightness unless you actually want Brighten or darken a photo locally..
Add the file type Gamma Image accepts. Hint from the path: gamma image. Apply a gamma curve to RGB.
Set only the options that match Gamma Image. Neighbor Image Contrast does something else (Raise or lower contrast.). Tool note: Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only.
Run Gamma Image in this tab. Browser memory still applies: Gamma 0.4–3 per channel. PNG. First GIF frame only. Max 20 MB.
Download or copy the result from Gamma Image. If it is the wrong job, open Adjust Image Brightness instead.

When not to use Gamma Image

Skip Gamma Image when a neighbor tool matches better — start with Adjust Image Brightness or Image Contrast — or when the description already warns the job will fail. In the tool’s own words: Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only.

Questions about Gamma Image

What does Gamma Image do that other Images pages on this site do not?: Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only. Short version: Apply a gamma curve to RGB.
Does Gamma Image upload my file or text to Tool-You servers?: No. Gamma Image runs in this browser tab. Files stay on the device. Limit note: Gamma 0.4–3 per channel. PNG. First GIF frame only. Max 20 MB.
Should I use Adjust Image Brightness instead of Gamma Image?: Use Gamma Image when you need Apply a gamma curve to RGB. Use Adjust Image Brightness when you need Brighten or darken a photo locally. They share a category (Images) but not the same job.
What are the limits of Gamma Image?: Gamma 0.4–3 per channel. PNG. First GIF frame only. Max 20 MB. Also: Raises each channel with 1/gamma, 0.4–3. Unlike Brightness this is a power curve, not a percent add. Unlike Contrast this does not pivot around mid gray. PNG out. First GIF frame only.