# Luma Histogram

The Luma Histogram displays the range of luminance levels in the video signal, with black on the left and white on the right. The height of each line corresponds to the percentage of the image that occurs at that luminance level.

![](/files/4ifpBq8dKAlrQIjqWcC5)

### Controls

#### Scaling

The Luma Histogram can be toggled between "log" and "linear" scaling. In log mode, each horizontal graticule represents an order of magnitude - 10, 100, 1000 and so on. This means that even luminance levels with relatively low frequency within your signal will be easily visible within the palette.

Linear scaling causes the vertical axis to be scaled to the height of the most populated luminance level.

#### HDR Overlays

HDR overlays show a lower fidelity histogram of common ST2084-specific luma ranges, along with a total coverage percentage.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hedge.video/scopebox/palette-types/luma-histogram.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.