Visibility of density unevenness area appeared on printed images varies depending on some characteristics of input images. We focused on Saliency and Spatial frequency of tone distribution as those characteristics to clarify a mechanism for perceiving image noise. In this study, we performed examinations for detecting density unevenness area. Shapes of the density unevenness are circle and belt-like. As results, we found that specific spatial frequency components in original tone distribution, which is similar to that of the density unevenness, correlated with the visibility of density unevenness. Trends between statistic values of saliency and visibility of density unevenness showed different depending on the polarity of density change. We could not clarify factors of this phenomenon. Finally, those statistic values of saliency which we studied were not proved as parameters affecting to visibility of density unevenness. All correlations for belt-like density unevenness were weaker than in case of circle. Some impacts of their size or continuity were supposed.