How to understand and apply the relation between light and color in PS

PS is the strength of the mix between layers, if you do not light and the basic principles of color, then you see the great God's tutorial does not know how the color effect is produced, learning is simply a step and process, so never have their own real original things.

When it comes to light and color, let me not say anything else, but first look at how the color is displayed in PS.

Open your PS Color selector panel (color picker) and see what's inside.

The Four colors (light) representations are represented by the four red boxes circled in the figure. The following one to illustrate the meaning of the

Look First group: HSB

This is a color representation: where "H" denotes hue, "S" denotes saturation, and "B" denotes lightness

The so-called hue is the type of color, such as: Red, yellow, blue, purple and so on;

Saturation indicates the purity of a color, such as reddish, crimson, and so on, and lightness denotes the hue and shade of a color.

This color pattern is generally applied in the palette.

Rgb

See RGB Everyone must be no stranger, yes, that means "red, green and blue" three colors. Maybe you know that "red, green and blue" is the primary color. But for PS not deep understanding of people, do not understand why use these three colors as three primary colors bar.

In fact, "red, green and blue" is the three primary colors of light, attention I said is the three primary colors of light, not the color of the three primary colors, light and color are two different concepts, we tend to confuse them.

According to scientists on the natural white light of the study found that all the light can be "red and green blue" three kinds of light from each other, and there is such a law: "Pure Red" + "pure green" = "yellow"; Pure red "+" "pure blue" = "magenta"; Pure green "+" pure blue "=" cyan ";" Pure red "+" pure green "" + "pure blue" = "white".

PS in order to be able to imitate the effect of this superposition of light, there is a "filter color" of this superposition mode.

Look at your layer overlay style, is there a "color filter" style? Now you know, in fact, the implementation of the "color" stack command, in fact, is to achieve the mixing effect of light.

In order to verify the correctness of my said, now operate in PS, realize the superposition effect of light.

Create a new background-transparent file, create a new three layer, fill the solid color in each layer, and then change the layer style to filter to see if it's the same as what I said above?

Again, the third mode: CMYK

In fact, the second mode is to describe the light, before I say the CMYK mode, I need to clarify the "carrier" of these two modes.

Generally we see objects broadly divided into two categories: one is the light source, that is, it can emit light objects, and the other is of course not luminous objects, we can see because it reflects the light of the outside world. Therefore, here is a more headache problem, we should carefully watch. If the light source, then we see the color of course is the color of light, for example, red lights emit red light, so we see that the light is reddish, if the object is not glowing, if we see that the object is red, it is not because the object is red, but this object will be the light of the outside of red absorption, Only the red light is reflected out, so we see the object is red. Puzzling is more normal, want to deeply understand everyone or Baidu bar, may be more clear than I said.

Said a lot of before, not for anything else, in fact, is to say that light and color is not a concept, really do not want to understand can not be understood, does not affect the back.

Then, CMYK mode. If you work in a print shop or have a print photo and other color printing experience, you may know that CMYK is actually used for printing, this mode is the primary color of printing, the exact color of the printing is "Green product Yellow" (CMK)

C means cyan; M is magenta (called Magenta in PS). Y means yellow. If you have the opportunity, you can take apart the color printer, the pigment box has at least three (in fact, there are at least four, will be explained later), respectively, cyan, magenta, yellow. Theoretically, the different proportions of the three pigments can be used to match any color. and "Cyan of 100%" + "100% magenta" = blue; 100% Cyan "+" 100% yellow "= green;" 100% Magenta "+" 100% yellow "= red;" 100% Cyan "+" 100% Magenta "" + "100% yellow" = black. In PS, in order to reproduce the color pattern, a "multiply" blending style appears.

Again, the following is validated in PS

In the above illustration, the layer style is multiply, and the color overlay mode appears.

Again to observe these two patterns, the discovery of the three primary colors of light after the printing of the three primary colors, printing three primary colors superimposed on the emergence of the three primary colors of light. Can you see that? This shows that the two color patterns are not independent, but are directly related to each other.

Here is a brief introduction to the relationship between light and color.

The above figure is found on Baidu, it can simply explain the relationship between light and color

The line in the figure represents the light, the RGB blend represents the white, the box represents the object, and the color of the object is the color of the object we are looking at.

Look at the first picture, when the white light to the Cyan object, the red light is fully absorbed, the rest of the green and blue is reflected, recall the knowledge we have learned before, green light and blue light after the combination of what? Right, yes, is green light, green light into our eyes, so see the object must be cyan (in fact, is not the object is the cyan). Looking at the second picture, the white light that shines on the object is absorbed, the remaining red and blue light is reflected, the red and blue are mixed with the magenta, so the object is magenta. The rest of the situation please think for yourself.

Well, after learning the above knowledge, I give you a question: In a completely dark room, the walls of the room is painted with cyan paint, at this time, open a red light, what color do you see the wall? The answer is downstairs, if you can answer correctly, you have a basic understanding of the relationship between light and color, Congratulations on being a step closer to the real God.

Reveal the answer to the above question: the walls are all black and the red light does not work.

Explain: Do you remember the pictures you saw before:

Look at the first picture: The Cyan object will absorb the red light completely, the blue wall will absorb all the red light above, and there is no other ray in the room, so no ray is reflected into the human eye, so the wall is black.

Think again, at this time can we say the wall is black? Under the white light it is cyan, so what color does an object show, it is affected by ambient lighting.

Now we know that CMYK is actually the primary color of printing. Remember just now I said that printing is the primary color CMY? But why do you need one more k? Actually k is black, you can set K to 100% in PS, the other is 0, see the color is pure black. Theoretically, using 100% cyan +100% Magenta +100% yellow can get pure black, but you know, in the computer simulation can be achieved, but in reality, we can not get completely pure single color pigments, and in the ingredients are not guaranteed to be 100%, So in fact, through this ratio is unable to get pure black, or red, or green, or yellow, such black extremely ugly, so, in the actual printing, single black ink for the separate printing, so that not only good printing quality, but also can save costs. About the printing is here, interested in the can find their own information to learn.

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