Thank you for publishing this study, here are my first questions:
- Why didn't you include JPEG 2000?

- Correct me if I'm wrong but JPEG-XR native color space is not Y'CbCr this 
means that this format had to perform an extra (possibly lossy) color space 
conversion.

- I suppose that the final lossless step used for JPEGs was the usual Huffman 
encoding and not arithmetic coding, have you considered testing the later one 
independently?

- The image set is some what biased toward outdoor photographic images and 
highly contrasted artificial black and white ones, what about fractal 
renderings, operating systems and 2D/3D games screen-shots, blurry, out of 
frame or night shots?

- I've found only two cats and not a single human face in the Tecnick image 
set, no fancy à la Instagram filters, this can't be seriously representative of 
web images, a larger image corpus would be welcome.
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