PSD file extension represent image file types that are created with the most commonly used professional image editing program, Adobe Photoshop. PSD image files may include image layers, adjustments, masks, notes, information’s … and other elements that are specific for Photoshop. PSD or PhotoShop Documents supports multiple color modes as: RGB, CMYK, grayscale, monochrome, duotone, Lab color, multichannel color mode … and others.