Example for the “Add Border” filter
This filter just does what its name says: it adds a border to the image.
You can specify the thickness of the border as well as the color. The
four sides of the border are colored in different shades, so the image
area will appear raised.
The image will be enlarged by the border size, it won't be painted over.
Activate the filter
This filter is found in the image window menu under
→ → .
“Add Border” options
Border X size, Border Y size
Here you can select the thickness of the added border, in pixels.
X size (left an right) and Y size (top and bottom) may be
different. Maximum is 250 pixels.
Clicking on this button brings up the color selector dialog that
allows you to choose an “average” border color (see
below, Delta value on color).
Delta value on color
This option makes the border sides to be colored in different
shades and thus makes the image to appear raised. The actual
color of the respective border side is computed for every color
component red, green, and
from the “average” Border color
(Resulting values less than 0 are set to 0, values greater than
255 are set to 255.):
Top shade = Border color + Delta
Right shade = Border color - ½ Delta
Bottom shade = Border color - Delta
Left shade = Border color + ½ Delta
Example: the default color is blue (38,31,207), default delta is
25. So the shades of the borders are: top: (38,31,207) +
(25,25,25) = (63,56,232), right: (38,31,207) + (-13,-13,-13) =