The color management system (hereafter, CMS) is designed to ensure accurate observation of images. CMS - which is indispensable when using Picture Style Editor - and color space, as the basis of CMS, are explained in detail. Recommendation to calibrate monitor Introduction of correct monitor adjustment method Color management settings for software Digital Photo Professional (hereafter, DPP) and Picture Style Editor color management setting is introduced. Color management settings for printouts Key points for printouts using color management with Easy-PhotoPrint Pro (hereafter, EPP-Pro) are introduced. Various color spaces and the color space width The various color spaces that can be used for digital cameras and DPP are described. Understanding the HSL Color System Introducing the HSL color system - indispensable for Picture Style Editor color specifications - in comparison to the HSB color system. HSL color system value range and Picture Style Editor functions The relationship between saturation and luminosity on HSL that arises during editing on Picture Style Editor is described.