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Ablation fronts and shocks are two radiative/hydrodynamic features ubiquitousin inertial confinement fusion (ICF). A specially designed shock-tubeexperiment was tested on the OMEGA laser facility to observe these two featuresevolve at once and to assess thermodynamical and radiative properties. It is abasic science experiment aimed at improving our understanding of shocked andablated matter which is critical to ICF design. At all time, these two moving"interfaces" separate the tube into three distinct zones where matter is eitherablated, shocked or unshocked. The {\it simple-flux} or {\it double-flux}experiments, respectively one or two halfraum-plus-tube, have been thought upto observe and image these zones using x-ray and visible image diagnostic. Thepossibility of observing all three regions at once was instrumental in our newradiographic image processing used to remove the backlighter backgroundotherwise detrimental to quantitative measurement. By so doing, afterprocessing the radiographic images of the 15 shots accumulated during the 2013and 2015 campaigns, a quantitative comparison between experiments and ourradiative hydrocode simulations was made possible. Several points of theprincipal Hugoniot of the aerogel used as a light material in the shock-tubewere inferred from that comparison. Most surprisingly, rapid variations ofrelative-transmission in the ablated region were observed during radiographicirradiations while it remained constant in the shocked region. This effectmight be attributed to the spectral distribution variability of the backlighterduring the radiographic pulse. Numerically, that distribution is stronglydependent upon NLTE models and it could potentially be used as a mean todiscriminate among them.

New radiographic image processing tested on the simple and double-flux platform at OMEGA