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Future missions such as Solar Orbiter (SO), InterHelioprobe, or Solar Probeaim at approaching the Sun closer than ever before, with on board some highresolution imagers (HRI) having a subsecond cadence and a pixel area of about$(80km)^2$ at the Sun during perihelion. In order to guarantee their scientificsuccess, it is necessary to evaluate if the photon counts available at theseresolution and cadence will provide a sufficient signal-to-noise ratio (SNR).  We perform a first step in this direction by analyzing and characterizing thespatial intermittency of Quiet Sun images thanks to a multifractal analysis.  We identify the parameters that specify the scale-invariance behavior. Thisidentification allows next to select a family of multifractal processes, namelythe Compound Poisson Cascades, that can synthesize artificial images havingsome of the scale-invariance properties observed on the recorded images.  The prevalence of self-similarity in Quiet Sun coronal images makes itrelevant to study the ratio between the SNR present at SoHO/EIT images and incoarsened images. SoHO/EIT images thus play the role of 'high resolution'images, whereas the 'low-resolution' coarsened images are rebinned so as tosimulate a smaller angular resolution and/or a larger distance to the Sun. Fora fixed difference in angular resolution and in Spacecraft-Sun distance, wedetermine the proportion of pixels having a SNR preserved at high resolutiongiven a particular increase in effective area. If scale-invariance continues toprevail at smaller scales, the conclusion reached with SoHO/EIT images can betransposed to the situation where the resolution is increased from SoHO/EIT toSO/HRI resolution at perihelion.

Quantifying and containing the curse of high resolution coronal imaging