1. An image encoding system comprising: (a) providing a first image; (b) quantizing a discrete cosine transform of said first image using a first set of quantization values; (c) quantizing said discrete cosine transform of said first image using a second set of quantization values; (d) comparing said first image to a spatial reconstructed image based upon said first set of quantization values using a model; (e) comparing said first image to a spatial reconstructed image based upon said second set of quantization values using said model; (f) selecting one of said first set of quantization values and said second set of quantization values based upon respective said comparing.