RGB, CMYK, LAB, HSB ... Maybe many friends have seen these color modes, but do you know them? Most friends will say they do n’t understand. Color mode is the most basic knowledge of graphic design. Each mode has its own advantages and disadvantages and has its own scope of application. Let me talk to you in detail about these color modes.
1.RGB mode
RGB is the color mode of colored light. R stands for red, G stands for green, and B stands for blue. The three colors are superimposed to form other colors. Because all three colors have 256 brightness levels, the three colors are superimposed to form 16.7 million colors. That is true colors, through them is enough to show in the gorgeous world.
In the RGB mode, red, green, and blue can be superimposed to produce other colors, so this mode is also called additive color mode. All devices such as displays, projection devices, and televisions rely on this additive color mode for implementation.
In terms of editing images, the RGB color mode is also the best color mode because it can provide a full-screen 24bit color range, that is, true color display. However, if the RGB mode is used for printing, it is not optimal, because some colors provided by the RGB mode are beyond the scope of printing, so when printing a true color image, you will inevitably lose part Brightness, and relatively bright colors will definitely be distorted. . This is mainly because the CMYK mode is used for printing, and the colors defined by the CMYK mode are much less than the colors defined by the RGB mode. Therefore, when printing, the system automatically converts the RGB mode to the CMYK mode. Post-distortion phenomenon.
2. CMYK mode
When sunlight hits an object, the object will absorb part of the light and reflect the remaining light. The reflected light is the color of the object we see. This is a subtractive color mode, but also a fundamental difference from the RGB mode. Not only do we use this subtractive mode when looking at the color of an object, but we also apply this subtractive mode when printing on paper.
According to this subtractive color mode, the CMYK color mode suitable for printing has evolved.
CMYK represents the four colors used in printing, C represents cyan, M represents magenta, Y represents yellow, and K represents black. Because in actual reference, cyan, magenta and yellow are difficult to superimpose to form a true black, at most it is only brown. Therefore, K-black was introduced. The role of black is to strengthen the dark tone and darken the dark color.
The CMYK mode is the best printing mode. Although the RGB mode has many colors, it cannot be completely printed. So is it using CMYK mode when editing? No, the reasons are as follows:
Although editing in CMYK mode can avoid the loss of color, the calculation speed is very slow. The main reasons are as follows: 1. Even when working in CMYK mode, Photoshop must change the CMYK mode to the RGB mode used by the monitor. 2. For the same image, RGB mode only needs to process three channels, while CMYK mode needs to process four feeds?
Since the scanner and display used by the user are RGB devices, whenever there is work in the CMYK mode, there is a process of converting the RGB mode to the CMYK mode.
Therefore, whether to apply CMYK mode for editing is a matter of conversion between RGB mode and CMYK mode.
Here is a suggestion, it is my experience. Use RGB mode for editing first, then CMYK mode for printing, and then convert before printing, then add necessary color correction, sharpening and rest. Although this makes Photoshop slower in CMYK mode, it can save most of the editing time.
In order to quickly preview the display effect of the image in CMYK mode, you can use the CMYK Preview (CMYK Preview) command under the View menu without switching the mode.
This mode conversion before printing is not the best way to avoid image loss. The best method is to combine Lab mode and CMYK mode, which can minimize image distortion. The Lab mode is introduced below.
3. Lab mode
Lab mode is a color mode published by the International Lighting Commission (CIE) in 1976 (Wow, so far away.).
You already understand: RGB mode is an additive color mode for light-emitting screens, and CMYK mode is a subtractive color printing mode with reflective colors. So, what processing mode does Lab have?
The Lab mode does not depend on light or pigment. It is a color mode determined by the CIE organization that theoretically includes all colors that can be seen by the human eye. Lab mode makes up for the shortcomings of RGB and CMYK color modes.
Lab mode consists of three channels, but not R, G, and B channels. One of its channels is brightness, or L. The other two are color channels, denoted by A and B. Channel A includes colors from dark green (bottom brightness value) to gray (medium brightness value) to bright pink (high brightness value); channel B is from bright blue (bottom brightness value) to gray (medium brightness) Value) to yellow (high brightness value). Therefore, this color mixture will produce bright colors.
Lab mode defines the most colors and has nothing to do with light and equipment and the processing speed is as fast as RGB mode, much faster than CMYK mode. Therefore, you can use the Lab mode in image editing with confidence. Moreover, when the Lab mode is converted to the CMYK mode, the colors are not lost or replaced. Therefore, the best way to avoid color loss is to use Lab mode to edit images, and then convert to CMYK mode for printout.
When you convert RGB mode to CMYK mode, Photoshop will automatically convert RGB mode to Lab mode and then to CMYK mode.
In terms of expressing color range, Lab mode is the first place, RGB mode is the second place, and CMYK mode is the third place.
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