Final answer:
Photoshop Blend Mode does not consist of only three colors; this is false. Blend Modes provide various ways of blending image layers together in Photoshop, which is different from the concept of primary colors in color vision. The true color of an object is determined by its absorption and reflection of light wavelengths.
Step-by-step explanation:
The question regarding Photoshop Blend Mode asks if it consists of three colors, the answer to which is false. Photoshop Blend Mode is not restricted to three colors but instead offers a way to determine how two layers are blended together based on the color and luminance values in each layer. Blend Modes affect the compositing process of images, and while the concept of primary colors in color vision involves three colors (red, green, and blue for additive color mixing), this is not the case for Photoshop Blend Modes which offer a variety of options for blending images including modes like Multiply, Screen, Overlay, and many more.
A simplified theory of color vision does state that there are three primary colors that correspond to the three types of cones in our eyes. These primary colors - red, green, and blue - can be combined in various ways to produce all the hues that we see. However, the Blend Modes in Photoshop are a separate concept, dealing with the blending of images and do not directly relate to the physiological basis of color vision.
The true color of an object is related to what wavelengths of light it reflects and absorbs; the color that our eyes perceive is the light that is not absorbed by the object. Similarly, the color of a light source is related to the wavelengths it emits. While blending modes in Photoshop do affect perceived color by changing how layers interact, they are not limited to just three colors.