Colour Color ring

Colour Color ring

one of the big features of Photoshop is the color grading of digital photos.

Speaking of color palette naturally, we know that the color patterns in Photoshop are commonly used in RGB, CMYK, HSB, and lab, and the most commonly used are RGB and CMYK.

so let's take a look at the Hue ring chart and the corresponding relationship with 360°,

Red Orange green Blue ingot Violet

Simplified diagram:

RGB and CMYK is a more abstract color mode, then give you an RGB value can you push to determine what color? We look at an RGB value (r91,g26,b134), let's break it down, break it down into (r26,g26, B26) + (r65,g0,b108), and break it down to (R26,G26, B26) + (r65,g0,b65) + (R0,G0,B43) , why is it so divided? Because the first group is dark Gray, the second group of RB synthesized as G's complementary color M magenta, the third group good understanding, is dark blue, then this RGB value represents dark magenta blue, that is, purple, can be decomposed into such as:

Color ①= color ⑤+ color ②= color ⑤+ ③+ color ④

Let's look at the various kinds of HSB values, such as:

②= color ③+ Color ④ for the clarity of the B color ①= ⑤+ color ②

This reflects the color coloring principle of RGB.

In the case of Hue H, the color ①= color ②, indicating to the hue of the color added gray, its hue is unaffected, but the saturation decreases, the brightness increases. and color ② hue value between the color ③ and the color ④, and the bias color ③, also is consistent with the color principle, see the Hue ring chart.

Here's an experiment, create a new three layers in Photoshop, fill in the color ⑤, the color ④, the color ③, and change the blending mode of Layer 2 and Layer 3 to linear Dodge, for example, the resulting color is the same as the color ①.

In fact, in Photoshop, the mix of RGB colors should be filter (screen), it is not as blunt as the linear dodge, if the color filter to mix the three colors, the results are different, but we are to get a color from the RGB value of the subjective impression, So just to get an approximate color.

Our real life photos are rarely solid color, in general, the color encountered in life is a red and green Blue (RGB) in one and Green Yang (CMY) and a certain degree of gray synthesis, to a certain amount of RGB values, we first find out three values in the center of the color, Then judge what color it is mixed, according to the smallest value to determine the saturation of the color (that is, how much gray in the solid color), integrated RGB values to see its brightness.

For example, the RGB value (130,190,90) can be regarded as (130,130+60,130-40), that is, green plus blue color yellow, should be yellow-green, saturation and brightness are about medium, so as to form a general perceptual knowledge, we can of course, from the mathematical saturation and brightness of the formation of rational understanding, with R , G, B Three numeric values, set Max as the largest of them, Min is the smallest of them, then the saturation of s=1-min/max;b=max/510.

So we go to the point of today, or on the previous color (r91,g26,b134), we create a new optional color adjustment layer, after the experiment, only adjust the magenta and blue sliders for the image is only useful, the following to adjust the blue as an example, reduce cyan, increase magenta, reduce yellow, proportional value is arbitrary. You can see that the decrease in cyan is to increase the red, the R value increases, the increase of magenta is to reduce the green, the G value is reduced, yellow is the increase of blue, B value increases. The meaning of regulating magenta is the same. In fact, we can see from the CMYK more clearly the value of the change, careful observation will find that the adjustment of black to the image does not affect, because its CMYK value of black is 0. The addition of magenta unexpectedly will make m value slightly lower, this is the reason for reducing the yellow, its intrinsic reason is what I am not good to say, may be the impact of various ink.

From the above example we can draw two conclusions, first, the optional color of the hue adjustment is limited, (can be seen from its HSB value), so if you want to make a large-span hue change, you need to use the hue saturation tool to adjust, and then with the optional color fine adjustment; Using CMYK to observe can be more intuitive to get results, so if we want to adjust to a color, it is best to turn CMYK to adjust.

The above picture is a single color image, if it is a picture, how do we know which color is adjustable, which is not adjustable? Can not always a pixel of a pixel analysis it! One way is to observe that the photo has green grass, then it should be green adjustable, there is blue sky, then blue or cyan adjustable. Another option is to open the color range in the Select menu.

Color (Chroma): abbreviated C, the purity of the color, that is, the saturation of the color. In particular, it indicates whether a color contains white or black ingredients. If a color does not contain white or black ingredients, it is "solid color", the highest color, if it contains more white or black ingredients, its color will gradually decline.

Because of the hue, lightness, saturation, harmony between the elements caused by unreasonable.
Color principle: hue, lightness, saturation.??


saturation, which refers to a standard color. of how much.

Colour Color ring