These surfaces will show different color changes under different light. When we say that we want to use color to shape the body, we mean to draw the change of color with different decent turns, not just the change of light and shade of the same color to shape the body. The following is an example of the change of temperature and fresh ash under different lighting conditions to illustrate this color change.
The relationship between cold and warm of outdoor objects on sunny days.
The cold and warm relationship of outdoor sunny objects can be roughly summarized as follows: the bright surface is warm, the dark surface is cold, and the reflective surface is the warmest. "Surface" refers to the general soil. Specifically, the following differences can be made. The color characteristics of the light-receiving surface of an object are warm and fresh. Ancient highlights, bright surfaces, midtones, etc. The characteristics of each area are wrapped by the light-receiving surface. The object in the highlight has lost its inherent color and is close to the color of the light source-sunlight. The highlight of a cold object is warmer than its real color; Colors in warm colors are colder than natural colors.
Bright surface Bright surface Because of the spectral balance of sunlight, all colors will appear bright. But in too strong sunlight, such as noon in midsummer, bright colors will be bleached, but the purity will be reduced.
The middle key is the part of the side of the object facing the sun, and the sun weakens, and the skylight also has a certain influence on it. The middle tone is cooler than the glossy one, and the purity is lower.
Backlight surface The backlight surface of an object includes three parts: dark surface, reflective surface and projection surface.
The dark side of a dark side object has different reflected light effects. The blue skylight affects the upward face of the object in the shadow, and the color tends to get cold; The reflected light from the surface affects the downward surface of the object, and its color tendency depends on the color of the surface. If the surface is soil, it will affect the warm and yellow color of the dark part; If the face is green, the face with the dark part facing down tends to be warm green.
The color change of reflection is the most complicated, which is mainly determined by the color of nearby light-receiving objects. When the reflector is close to the dark side and the color of the reflector is lighter, it has a great influence on the color of the dark reflective surface; Distant and dark objects have little effect on the reflective surface of the dark part.
In short, the temperature of the reflecting surface changes with the color of the reflecting object.
Projection When shadows are projected on a plane, such as figures and tree shadows on the plane, they are mainly influenced by the blue sky, and their colors are blue. When the shadow is cast on the vertical plane, such as the shadow cast on the wall, the bottom is greatly affected by the surface reflection and is warmer; The high-end is greatly influenced by the color of the sky, and it is cold.
Outside on a sunny day, the objects in the shadow are mainly illuminated by the blue sky. Its color characteristics can be roughly summarized as: the open surface is cold, the warm surface is warm, and the projection is the coldest. The specific decomposition can be listed as follows: the bright surface color is cold, tends to lose its true color, and tends to be the light source color-the blue sky color is bright, and the middle tone is not right for the blue sky, so it shows the influence of the surrounding environment, and the general tone is warmer than the bright surface.
The dark side of outdoor backlight is sunny, and the dark side of the object in the shadow is the side of the blue sky that can't reflect light, mainly showing the reflected light of the surrounding objects.
The color is warmer than the blue light, so the color of the backlight surface of the object is often warmer than the color of the light-receiving surface irradiated by the blue light, and the projection edge of the object in the shadow of a sunny day is blurred. Because the projection is on the horizontal plane, facing the blue sky, most of them are shadows with blurred edges and cold colors.
Color relationship of objects in indoor north window light
Studio lighting generally requires a stable light source with little change, so most people choose to reflect light from the sky to avoid direct sunlight, because sunlight moves and changes too fast, which is not conducive to sketching. The skylight tilted to the north in the room, or the skylight injected from the window of the north wall, conforms to the sketch of the studio. Avoid brightly colored reflective objects facing the north window, such as big red walls and green trees, to reflect red and green light indoors. That will seriously affect the painter's observation and expression of color when painting.
Generally speaking, the light source color of the north window skylight is colder than the sunlight. Although it is relatively stable, it is not completely unchanged. The cloudless blue sky in Wan Li is coldest on sunny days, a little colder on cloudy days, and a little warmer when thin clouds cover the sun.
Let's take a concrete look at the changes of temperature and warmth of indoor objects with different decent faces.
Because the indoor reflection of environmental color is weaker than that of outdoor, the color purity of the whole light-receiving surface is higher than that of the dark surface. The color of indoor light receiving surface is colder than that of outdoor objects in the sun and warmer than that of outdoor objects in the shadow.
The high light spot of the object in the high light room is close to the color of the light source. The highlight of a cold object (such as a blue porcelain bottle) looks warmer than its real color. The highlight of a warm object, such as a nose, looks colder than its true color.
The purity of bright colors of indoor bright objects is higher than that of dark colors, and the true colors of objects are more vivid. So when the light is bright, the bright side of a cold object is colder than the dark side. On the contrary, the bright side of a warm object is warmer than the dark side.
The middle tone is opposite to the light source, and the purity is slightly lower than the bright side. Cool and warm colors tend to be ambient colors.
Backlight surface The overall trend of the backlight surface is lower than that of the light receiving surface. Generally, the dark side of warm objects tends to be cold gray, and the dark side of cold objects tends to be warm gray. The difference between warm color objects and cool color objects decreases, and they become close to each other.
The purity of the dark side decreases. The dark side of a cold object turns gray and warm; The dark side of a warm object will turn gray and cold.
Generally speaking, indoor reflection is much weaker than outdoor reflection, and the specific tendency to warm color depends on the color of the surrounding reflective objects.
Due to the weak indoor reflected light, the purity of the projection part decreases. The dark side of a cold object turns gray and warm; The dark side of a warm object will turn gray and cold.
From the above analysis, it can be seen that the once widely circulated rule of conditional discoloration is that "under the cold light source, the bright part of the object becomes cold." The dark part warms up; The statement that the bright part gets warmer and the dark part gets colder in warm light should be said to be inaccurate and does not conform to the actual situation. For example, a blue dress in Xuannei sits on an orange chair. The bright part of the dress is bright blue, while the dark part of the blue dress is not obvious, but turns gray and warm. An orange chair is bright and warm, while the dark color of the chair turns gray and cold. Under the cold and warm light sources, the scenery changes of different colors show opposite changes, but tend to be consistent in purity, that is, the bright surface becomes brighter and the dark surface becomes darker.