8.51. Průměr okraje

8.51.1. Overview

Obrázek 16.221. Example for the Border Average filter

Example for the „Border Average“ filter

Original image

Example for the „Border Average“ filter

Foreground color in the Toolbox after applying the Border Average filter

This plug-in calculates the most often used color in a specified border of the active layer or selection. It can gather similar colors together so that they become predominant. The calculated color becomes the foreground color in the Toolbox. This filter is interesting when you have to find a Web page color background that differs as little as possible from your image border. The action of this filter is not registered in Undo History and can't be undone with Ctrl+Z: it doesn't modify the image.

[Poznámka] Poznámka

This command only works on RGB images. If the image is Grayscale or Indexed, the menu entry is disabled.

8.51.2. Activating the Filter

This filter is found in the main menu under ColorsInfoBorder Average….

8.51.3. Options

Obrázek 16.222. Options of the Border Average filter

Options of the „Border Average“ filter

Velikost okraje

The border Thickness in pixels.

Počet barev

Velikost vědra nastavuje počet barev uvažovaných při výpočtu průměrné barvy (1 - 256).

8.51.4. Examples illustrating the Border Average filter

Obrázek 16.223. Original image

Original image

Original image: colors are pure Red (255;0;0), pure Blue (0;0;255), and different but similar kinds of Green ( 0;255;0 , 63;240;63 , 48;224;47 , 0;192;38 ).

Obrázek 16.224. Number of Colors is set to 8:

„Number of Colors“ is set to 8:

The resulting color is a Red (254,2,2).

The bucket size is low. So the bucket number is high. All color shades can be stored in different buckets. Here, the bucket containing red is the most filled. The resulting color is a nearly pure Red (254,2,2) and becomes the foreground color in the Toolbox.

Obrázek 16.225. Number of Colors is set to 64:

„Number of Colors“ is set to 64:

The resulting color is Green (32,224,32).

Here the bucket size is high, the number of buckets low. Similar colors (here green) are stored in a same bucket. This green bucket is now the most filled. All colors in this bucket have the same values for the two most significant bits: (00******;11******;00******). The remaining 6 bits may have any values from 0 to 63 for the respective channel. So in this bucket, color red channels range from 0 to 63, green channels from 192 to 255, blue channels from 0 to 63. The resulting color is Green (32,224,32), which, for every channel, is the average between the limits of the channel range (63 + 0)/2, (255+192)/2 , (63+0)/2.