You can also create a new shape by fusing one or more images. The new pattern is a random mix of matching tiles from the source images, with a direction tendency towards the centre of the image. You can select one or all of the images in this list by mouse-clicking, click again to deselect. Note, that the image you opened Fuse from is not used in the fusing process unless you select it in this menu or check the Use target as template button. The parameters list starts with Tile Size , which controls the size in pixels of the square tiles.
Small tiles produce smoother images, but makes the operation very slow.
Overlap determines by how many pixels the selected tiles should overlap in the fused image. The recommended amount is somewhere between a quarter and a third of the tile size. Search time refers to how long the filter should search for the tile that best fits the overlap. Search time also slows down the process, but results in a smoother output. When you check Use target as template , Fuse has to determine what's most important - to find a tile that matches the template, or a tile that matches the overlap.