What are the differences between the various color modes in ps?

What are the differences between color modes?

1. RGB color mode?

This is the most commonly used mode in Photoshop, also known as true color. model. The image quality displayed in RGB mode is highest. Therefore, it has become the default mode of Photoshop, and many effects in Photoshop need to be effective in RGB mode

RGB color mode is mainly composed of R (red), G (green), B (blue) The three basic colors are added together for color matching, and form three color channels: red, green, and blue. Each color channel contains 8-bit color information. Each information is represented by a brightness value of 0~255, so these 3 Each channel can be combined to produce more than 16.7 million different colors

So when printing images, you cannot print images in RGB mode. In this case, you need to change the image in RGB mode to CMYK mode. If you convert an image in RGB mode, color loss or color cast may occur. ?

2. HSB mode?

The establishment of HSB mode is mainly based on the way humans perceive colors. The human eye cannot distinguish the proportion of each primary color in the RGB mode. , but can only distinguish color type, saturation and intensity. HSB color is based on this characteristic of the human eye and has formed an intuitive method that humans can distinguish colors directly with their eyes. It mainly regards color as consisting of hue (Hue), saturation (Saturation), and brightness. (Brightness) composition.

In this, these three components all describe different meanings. For example, hue refers to different color distinguishing characteristics given by different wavelengths. For example, red and green have different hue values. ; Saturation refers to the depth of a color, that is, the relative purity of a single pigment. For example, red can be divided into deep red, magenta, light red, etc.; brightness is used to express the intensity of a color, which describes the amount of light reflected by an object and the amount of light absorbed. Quantity ratio. The HSB slider can be selected from the pop-up menu by clicking the horizontal black triangle in the upper right corner of the Color Functions panel.

HSB mode is represented by an angle of 0-360 degrees. It is not expressed as a percentage as we understand it. It is like a large wind wheel with color. Every time it rotates a little, its color changes. Based on this circumferential angle, changes are made that comply with certain rules. ?

3. CMYK color mode?

This is also a commonly used color mode. When printing an image, its color mode must be converted to CMYK mode. Therefore, this mode is mainly used in industrial printing. CMYK mode is mainly based on the subtraction of four colors: C (cyan), M (magenta), Y (yellow), and K (black).

Therefore, it also consists of 4 channels of cyan, magenta, yellow, and black, and each channel is mixed to form a variety of colors. It is worth noting that if these 4 solid colors are included during printing, they must be 100% solid colors. For example, if black is not set to pure black when printing, it will not be sent successfully when printing film, that is, the image cannot be printed. Since many of Photoshop's filter effects cannot be used in CMYK mode, RGB mode is generally used and is only converted to CMYK mode when printing is about to occur. At this time, the color may change. ?

4. Grayscale mode?

The image in grayscale mode only has grayscale and no other colors. Each pixel is represented by 8-bit or 16-bit color. If you convert a color image to grayscale mode, all colors will be replaced by different grayscales. ?

5. Bitmap mode?

Bitmap mode uses black and white to represent images, and does not include grayscale and other colors, so it is also called a black and white image. . If you convert an image to bitmap mode, you should first convert it to grayscale mode. ?

6. Two-tone mode?

As mentioned earlier, CMYK mode, that is, four-color mode, is used when printing, but sometimes the image only contains two colors and It matches the colors, so to save costs, you can use duotone mode. ?

7. Lab color mode?

Lab color mode is Photoshop’s built-in mode, and it is also the mode with the widest color range among all modes, so when performing RGB and CMYK modes During the conversion, the system will first convert to Lab mode and then to CMYK color mode. But in general, Lab color mode is rarely used. Lab mode is composed of three channels: brightness (L), a (from green to red), and b (from blue to yellow). The value ranges of a and b are both -120~120.

Extended information:

The three primary color light model (English: RGB color model), also known as the RGB color model or the red, green and blue color model, is an additive color model that combines red ( The three primary colors of light (Red), Green (Green), and Blue (Blue) are added in different proportions to produce a variety of colored lights.

The main purpose of the RGB color model is to detect, represent and display images in electronic systems, such as televisions and computers, but it also has applications in traditional photography.

Before the electronic age, the RGB color model already had solid theoretical support based on human perception of color.

RGB is a device-dependent color space: different devices detect and reproduce specific RGB values ??differently because of the color substances (fluorophores or dyes) and their effects on red, green, and blue. The individual response levels vary from manufacturer to manufacturer and even from time to time for the same device.

Reference: Baidu Encyclopedia - Adobe Photoshop