Images have an aspect ratio which is comprised of the height and width of the image. If a created collage differs from the aspect ration of the slideshow you can here decide how to display the collage.
Keep: The collage retains borders when being played back.
Crop: Parts are cropped from the edge of the collage until the collage fits into the correct aspect ratio without edges emerging.
Distort: The collage is inserted into the aspect ratio of the slideshow, whereby a distortion of the image takes place.
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