How to draw?

There are various versions of paintings displayed in the bookstore, and those exquisite art publications should be photographed first and then printed. The shooting quality has a key influence on plate making and printing. In addition, painting has many uses, such as printing photos, lighting boxes, making slides and so on. Painting requires horizontal and vertical, no loss of details, accurate color reproduction, in order to reproduce the original style. The equipment used to shoot Chinese painting, gouache painting, sketch and other works should be nailed to the wallboard, while oil painting, axis painting and frame painting need to be hung on or leaned against the wallboard, so the wallboard is one of the essential equipment for shooting. The wallboard shall be flat and vertical to the ground. The wallboard of some cultural relics and professional photography studios are mostly coated with flat thin iron sheets, and the paintings are attracted to the iron sheets with magnetic nails or magnetic strips, which is quick and convenient to use and will not damage the picture. The color of the wallboard can be painted in a medium gray tone, and the reflectivity is 18%, which can be used as the basis for photometry. In addition, vertical lines and horizontal lines should be drawn on the wallboard to center the painting. Cameras used for painting should be cameras with camera backs and single-lens reflex cameras to avoid parallax; General standard-medium focus range is better for the lens to avoid picture distortion; The tripod should be as stable as possible to avoid camera shaking; The photosensitive material should be medium and low speed film with fine particles and accurate color reproduction. Such as Kodak EPP, EPR (daylight type), EPY64T (illumination type) and other color reversal films, as well as Kodak VPS (daylight type), VPL (illumination type) and other color negative films. Fuji's professional reverse films can be Astia, Provia and REALA negatives. These films all have good performances. All kinds of movies should be shot before shooting. According to the shooting situation, the sensitivity and color balance of this latex number should be slightly adjusted. When using color film, we should pay attention to whether the color temperature of the film matches the color temperature of the light source. For example, a half-shot sunshine film needs to be shot in the light, or a half-shot light film needs to be shot in the sun. If this situation is inevitable, we should consider using color temperature conversion filters, such as Leiden 80A or B 12 (sunlight film is shot under incandescent lamp), Leiden 85B or A 12 (light film is shot under sunlight). Most of the light sources used in painting are indoor artificial light sources. Depending on the film used, there are two kinds of color temperature lamps to choose from. One is a light source with a color temperature balance of 3200K for standard light, such as strong light, iodine tungsten lamp, tungsten bromide lamp, etc. , and 500W powerful light bulbs are used more. This kind of lamp has stable color temperature, uniform light and convenient observation and focusing, but its disadvantages are short bulb life, low brightness and high temperature. Iodine tungsten lamp and tungsten bromide lamps have higher brightness, such as 1000W, 1300W, etc. These lamps are also high in heat, not as uniform as strong light, and consume a lot of electricity. The above light sources are all thermal light sources, which are not conducive to the original works when shooting ancient paintings and cultural relics, and are not allowed to be used by the general cultural relics department. The other light source is the studio flash, which is balanced with the color temperature of 5500K of standard sunlight. Studio flash is a so-called cold light source recognized by the cultural relics department. The color temperature of flash lamp in advanced studio is accurate and stable, and uniform illumination can be obtained without adding a soft box. Studio flash for painting requires high power, high index and adjustable brightness. Among them, the modeling light must also be on, so as to accurately observe the lighting effect and the reflection of the shooting picture. Studio flash is instant flash, low power consumption, fast start-up, high brightness, accurate color temperature and durability. It is an ideal light source for painting. Lighting is very important for painting, and the position of lighting should be arranged according to the texture and reflection of painting. Chinese painting, for example, is mostly paper and silk, with low reflectivity. Although silk is somewhat reflective, it is not serious.