# SumatraPDF recolor

**Available in [pre-release 3.7](https://www.sumatrapdfreader.org/prerelease)**

**Usage:** `SumatraPDF recolor [options] <input filename>`

A PDF can use several color spaces. You can use `recolor` to change the colorspace.

To convert a PDF to gray: `SumatraPDF recolor -o output.pdf -c gray input.pdf`

## All options

```
Usage: SumatraPDF recolor [options] <input filename>
  -c -    Output colorspace (gray(default), rgb, cmyk)
  -r      Remove OutputIntent(s)
  -o -    Output file
```