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

No. Equalize Image Luma runs in this browser tab. Files stay on the device. Limit note: Images. Luma histogram equalize. Output PNG. Max 20 MB.

Should I use Auto Contrast Image instead of Equalize Image Luma?

Use Equalize Image Luma when you need Histogram-equalize brightness. Use Auto Contrast Image when you need Stretch luma min–max to 0–255. They share a category (Images) but not the same job.

Equalize Image Luma

Histogram-equalize brightness.

Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.

What Equalize Image Luma does

Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.

Practical limit for Equalize Image Luma: Images. Luma histogram equalize. Output PNG. Max 20 MB. That is why output can differ from heavy desktop Images software. Read the tool-specific note again: Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.

How to use Equalize Image Luma

Stay on this Equalize Image Luma page (/equalize-luma-image). Do not switch to Auto Contrast Image unless you actually want Stretch luma min–max to 0–255..
Add the file type Equalize Image Luma accepts. Hint from the path: equalize luma image. Histogram-equalize brightness.
Set only the options that match Equalize Image Luma. Neighbor High Contrast Image does something else (Fixed 180% contrast, then PNG.). Tool note: Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.
Run Equalize Image Luma in this tab. Browser memory still applies: Images. Luma histogram equalize. Output PNG. Max 20 MB.
Download or copy the result from Equalize Image Luma. If it is the wrong job, open Auto Contrast Image instead.

When not to use Equalize Image Luma

Skip Equalize Image Luma when a neighbor tool matches better — start with Auto Contrast Image or High Contrast Image — or when the description already warns the job will fail. In the tool’s own words: Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.

Questions about Equalize Image Luma

What does Equalize Image Luma do that other Images pages on this site do not?: Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas. Short version: Histogram-equalize brightness.
Does Equalize Image Luma upload my file or text to Tool-You servers?: No. Equalize Image Luma runs in this browser tab. Files stay on the device. Limit note: Images. Luma histogram equalize. Output PNG. Max 20 MB.
Should I use Auto Contrast Image instead of Equalize Image Luma?: Use Equalize Image Luma when you need Histogram-equalize brightness. Use Auto Contrast Image when you need Stretch luma min–max to 0–255. They share a category (Images) but not the same job.
What are the limits of Equalize Image Luma?: Images. Luma histogram equalize. Output PNG. Max 20 MB. Also: Equalizes the luma histogram then scales RGB. Unlike Auto Contrast Image this uses CDF equalization, not min–max stretch. Unlike Grayscale Image this keeps color. Runs in the browser on a canvas.