Looking at an image that is blurry one wants to either fix it or at least try to prevent it in future. But sometimes blur effect can be used on purpose. Blur filters smooth transitions by averaging the pixels next to the hard edges of defined lines and shaded areas. Motion blur is in almost every TV program, but you don’t notice it. You are more likely to notice its absence, because its presence gives an air of realism. The lack of realism in images is also quite frequent and can be cased by extreme sharpness, which spoil the viewer’s impression. ImageConverter Plus blur effect gives your images added realism by rendering the illusion of object or camera movement.
https://www.imageconverterplus.com/features/color-effect/blur/