Smooth

This filter softens images by smoothing image bumps and nicks often produced as a result of image scanning, binarization or faxing.

Set the Bump/Nick Length value pixels to delimit the length of the bump (or nick) to be removed (or filled). All bumps and nicks less than or equal to this size are processed.

Favor option is used to set bumps/nicks processing preference. If the option is set to Long Bump/Nick, the program will process long bumps or nicks before short bumps or nicks. If Short Bump/Nickis selected, short ones are favored over long ones. For example:

Smooth the following image with Bump/Nick Length = 3

X X

XXXXXXXXXX

Favoring short would remove the two "bumps" giving:

XXXXXXXXXX

Favoring long would fill in the "gap" giving:

XXXXX

XXXXXXXXXX

Image modification is reflected in the viewport at the top of the dialog box and can be shown as color selection. To display changes in the resulting image, check Show Changes as Color Selection box and pick the colors in the Color Picker dialog that opens on click on Black Area and White Area buttons at the bottom of the dialog.