Size calculation of mounting head

The calculation method of the distance between Tianmu and the calligraphy and painting mounting field is different according to the different mounting formats and styles in different places. However, in the conventional mounting, the formula for calculating the ceiling and the field is that the size of the painting core is subtracted from the size of the total mounting height, and then multiplied by 60%, and the value plus 3 cm (including the size of the ceiling pole) is the standard size of the ceiling. The calculation formula of the venue is: the size of the total height of calligraphy and painting mounting, minus the size of the painting core, the number multiplied by 40%, and the value plus 6 cm (including the size of the pole) is the standard size of the venue.