Noname manuscript No. (will be inserted by the editor) Contrast Prescription for Multiscale Image Editing

Abstract Recently proposed edge-preserving multi-scale image decompositions enable artifact-free and vi-sually appealing image editing. As the human eye is sensitive to contrast, per-band contrast manipulation is a natural way of image editing. However, contrast mod-ification in one band usually affects contrasts in other bands, which is not intuitive for the user. In practice, the desired image appearance is achieved through an iterative editing process, which often requires fine tun-ing of contrast in one band several times. In this article we show an analysis of properties of multiscale con-trast editing frameworks and we introduce the concept of contrast prescription, which enables the user to lock the contrast in selected areas and bands and make it immune to contrast manipulations in other bands. Keywords multiscale image editing contrast enhancement interactive image processing HDR computational photography image decomposition