> For the complete documentation index, see [llms.txt](https://astra-image.gitbook.io/astra-image-6.0/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://astra-image.gitbook.io/astra-image-6.0/adjustment-tools/curves.md).

# Curves

The Curves adjustment allows you to precisely adjust the tonal range in your image. By left-clicking on the curves chart, you can add control points that can be dragged using the mouse. The x-axis of the chart represents input values, while the y-axis represents output values. Therefore, adjusting the curve in the bottom-left of the chart affects darker areas, and adjusting the curve in the upper-right affects brighter areas.

**Mouse Controls**\
\
**Left-click**\
this will add a control point\
\
**Right-click (while hovering over a control point)**\
this will delete the control point.

<div align="left"><figure><img src="/files/mHKybKg4gv88OGFJ1Pxn" alt="The Curves adjustment panel."><figcaption><p>The Curves adjustment panel.</p></figcaption></figure></div>

When processing in RGB color space, the individual red, green and blue channels can have independent curves. When in Lab color space, only the luminance can be adjusted.