How does ps make A4 book cover?

Do the cover of novels and magazines: it is the same as doing other images. First, create a new image file with the same size as the cover, and set the pixel value to 300DPI. Then insert a picture as the background, and then insert other picture materials needed for cover design, usually PSD pictures selected in advance. Adjust the size and position of each material. Input text, beautify the material and text, then assemble the layer and store it in JPG format. Note: If you want to print, you should set the color mode of the image to CMYK, and select "Positive Film with Backing" for the black image. If you print in RGB mode, the color will be distorted.