using lossless mode, disables all options. 4. Cheetah -- Enables coefficient reordering, context clustering, and heuristics for selecting DCT sizes and quantization steps. 5. Hare -- Enables Gaborish Filtering DCT heuristics. 7. Squirrel -- Enables dots, patches and spline detection as well as context clustering. 8. Kitten -- Optimizes the adaptive quantization for a psychovisual metric. 9. Tortoise -- allow you to quickly concentrate the particles towards the center or the edge of the spray area. Clustering amount: Positive values will make the particles concentrate towards the center of the spray area