To save an open image in CMYK format, specify [.tif(TIFF)], [.jpeg(JPEG)], [.psd(Photoshop Document)] or[.psb(Photoshop Big Document)] in [File] menu → [Export (Layered) ]/[Export (Single Layer) ] and [CMYK] for[Expression color]. For details on how to configure, see "[Export settings] Dialog Box" or "[Export settings]Dialog Box (For Photoshop Document and Photoshop Big Document)" .