1, represents the color of several ways: HSB, RGB, LAB, CMKY. HSB hue, saturation, lightness to represent three dimensions, is the RGB components of the red, green and blue to represent, LAB luminance and a, b to represent two color channels, CMKY cyan, magenta, yellow, black component to represent.
2, the three primary colors of light: red, green and blue corresponding to RGB, mainly for a screen, the three primary color: red, yellow, blue corresponds CMKY, mainly for the printing.
3, the printed color with a color display screen is not one to one, in RGB, RGB mixing can be represented by black, printing ink, due to the current manufacturing process of high purity can not create ink, adding the CMY the result is actually a dark red.
4, complementary color: the color circle in a color corresponding to the complementary color of a color is 180 itself.
5, contrasting colors: 120 refers to the distance between two colors degrees to 180 degrees with a color on a hue circle 24.
6, units of image pixels with a ppi (how many pixels per inch), said the other with dpi, including screen printing.
A pixel is a square, a pixel can have only one color, typically 72ppi image resolution, printing is generally 300dpi, a pixel is one byte.
7, the resolution: Resolution refers to the number of pixels, for example, display resolution is 1280x720 display would indicate that there are 1280 pixels in the horizontal direction, 720 pixels in the vertical direction.
8, when changing the resolution of the time, such as the resolution of the image changed from 72ppi 300ppi, increasing the image pixels, the image size becomes larger. Increased pixel is a pixel interpolation algorithm by copying around. Pixel interpolation algorithm: near replication (fastest), two linear, Bicubic (best).
9, when the image resolution is changed, the same image size, the image becomes blurred because of the reason with the screen resolution of the original image corresponding to the changed image resolution of the screen does not correspond.
