2. If we establish the size in PS, we must first change the unit to the printing unit of millimeters or centimeters.
3. This creates a cover size, and then you need to pull out the reference lines to determine their respective positions, open a new reference line in the view, and then the first reference line is the page size of the book 17cm.
4. Then create a second reference line. The second reference line plus the spine thickness of 2cm is established at 19cm.
As shown in the figure, the middle three parts are separated. After the final design draft comes out, it needs to be printed, and the printed part will be trimmed.