selecting DCT sizes and quantization steps. 5. Hare – Enables Gaborish Filtering, Chroma from Luma and estimates quantization steps. 6. Wombat – Enables error diffusion quantization and DCT heuristics. context clustering. 8. Kitten – Optimizes the adaptive quantization for a psychovisual metric. 9. Tortoise – Enables a more thorough adaptive quantization search. You can force-enable several of the options applied on this mathematical function is also finetuned by the encoder, this is called Adaptive Quantization. Because the encoder is able to pick the best solution for the compression (Depending on what