8.37. Max RGB
| 8. The “Colors” Menu |

### 8.37. Max RGB

#### 8.37.1. Overview

Figure 15.187. Example for the filter “Max RGB”

Original image

Filter “Max RGB” applied

For every pixel of the image, this filter holds the channel with the maximal/minimal intensity. The result is an image with only three colors, red, green and blue, and possibly pure gray.

#### 8.37.2. Activate the filter

This filter is found in the image window menu under Colors → Max RGB.

#### 8.37.3. Options

Figure 15.188. “Max RGB” options

Preview

  This preview displays, in real time, the resulting image after treatment by filter.

Parameter Settings

  Hold the maximal channels: For every pixel, the filter keeps intensity of the RGB color channel which has the maximal intensity and reduces other both to zero. For example: 220, 158, 175 max--> 220, 0, 0. If two channels have same intensity, both are held: 210, 54, 210 max--> 210, 0, 210.

  Hold the minimal channels: For every pixel, the filter keeps intensity of the RGB color channel which has the minimal intensity and reduce both others to zero. For example: 220, 158, 175 min--> 0, 158, 0. If two minimal channels have same intensity, both are held: 210, 54, 54 min--> 0, 54, 54.

  Grey levels are not changed since light intensity is the same in all three channels.

8.36. Hot |  | 8.38. Retinex