11.36. Color to Alpha
| 11. The Colors Menu |

### 11.36. Color to Alpha

Revision History
Revision $Revision: 2315 $ | 2007-10-21 | ude

#### 11.36.1. Overview

Figure 15.194. Example for the filter “Color to Alpha”

The Color to Alpha filter makes transparent all pixels with a selected color. An Alpha channel is created. It will attempt to preserve anti-aliasing information by using a partially intelligent routine that replaces weak color information with weak alpha information. In this way, areas that contain an element of the selected color will maintain a blended appearance with their surrounding pixels.

#### 11.36.2. Activate the filter

You can find this filter through Colors → Color to Alpha.

#### 11.36.3. Options

Figure 15.195. “Color to Alpha” filter options

Color

  Clicking on the From color swatch provides a color selection dialog where you can select a color. If selection of a precise color is required, use the Color Picker then drag and drop the selected color from the color picker to the From color swatch. Right clicking on the color will display a menu where you can select Foreground or Background colors, White or Black.

11.35. Colorify |  | 11.37. Filter Pack