Border removal

Using this filter you can remove borders you want to get rid of from 1-bit images.

In the Settings section of the dialog you can set Border Percent, Variance, and White Noise Length values:

• Border Percent is a percentage of the image dimension in which the border will be found. For most images, use 20. For example, if an image is 200 pixels wide, Border Percent is set to 20 and Border To Remove (see below) is set to Left, then the left border will be found in the area between the left edge of the image and a line 40 pixels from the left edge. If the border is closer to the edge of the image, use a smaller value. If the border is farther from the edge, use a larger value.
• Variance — Check box allows you to set the amount of variance tolerated in the border. If the border varies significantly in thickness, you should use a higher value for Variance. The possible value range is 0 to 10 pixels.
• White Noise Length — Input field is used to set the amount of white noise tolerated when determining the border. The measure units are pixels. Values of 0 to 10 are sufficient for most images.
• Border To Remove — Section of the dialog allows you to select the side(s) border(s) will be removed from. You can select the Left, Right, Top, Bottom boxes separately or in any combination.

Image modification is displayed in the viewport at the top of the dialog box. It can also be shown as color selection. To display changes in the resulting image, select the Show modification as color selection check box and pick the color in the Color Picker dialog box that opens by click on the button at the bottom of the dialog.