# Antialias

## Overview

This filter reduces alias effects (see Antialiasing) using the Scale3X edge-extrapolation algorithm.

Scale3X is derived from Scale2X, which is a graphics effect to increase the size of small bitmaps guessing the missing pixels without interpolating pixels and blurring the images.

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Scale2X was originally developed to improve the quality of old Arcade and PC games with a low video resolution played with video hardware like TVs, Arcade monitors, PC monitors and LCD screens.

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The Antialias filter works as follows:

For every pixel,

- the filter expands the original pixel in 9 (3×3) new pixels according to the Scale3X algorithm, using the colors of the pixel and its 8 adjacent pixels (extrapolation);

- then the filter subsamples the new pixels to a weighted average pixel.

## Activating the Filter

This filter is found in the main menu under Filters Enhance Antialias .

## Examples

The following examples illustrate the effect on some patterns. The small squares are one pixel in size (zoom 16:1).

Original image (zoom 16:1)

Antialias applied (zoom 16:1)

Filters Enhance Antialias
Antialias