The issue of accurate color reproduction is a hot topic, which is closely linked to the problem of accurate measurement
of the human visual threshold, or "Just Noticeable Difference" (JND). Since most imaging scientists believe that JND
experiments are too complicated and costly, "Visual Difference" (dV) experiments have gained high popularity.
Typically the results of dV experiments are extended in place of JND, and many scientists interchange dV for JND. For
example, the current standard color difference formula CIE DE 2000 was constructed on a dataset from dV experiments.
However, in order for the "dV to JND" transition to be correct, several assumptions are taken, and whose haven't
actually been proven. This paper proposes a relatively inexpensive experiment that will allow a precise JND
measurement experiment, which in turn will let verify the assumptions for the dV to JND transition, and perhaps offer a
better dataset for development of a more robust and solid color difference formula.
The paper presents an undertaking to develop most compact high dynamic range image compression format and shows that chromatic color coordinate system plays a central role in such development. Important design considerations, such as conditions and criterions of data accuracy, efficiency and characteristics of color space, are addressed along the way. An additional trade-off between data precision and data size is discussed, and new feature of parameterized precision is introduced. Detailed comparison of Bef, Luv, Yxy chromatic coordinates is performed and special case of color space singularities is analyzed. LinLogBef imaging format implementation is presented and compared against OpenEXR and Radiance HDR formats by compression ratio, relative error and dynamic range characteristics. Other benefits provided by LinLogBef are further discussed, such as the format's convenience for image editing operations.