Categories of Photoshop image patterns

One, bitmap mode

Bitmap mode is a color pattern that contains only black and white, so bitmap-mode images are also called Black-and-white images, and only grayscale and Duotone modes can be converted to bitmap mode editing. It contains the least amount of information and thus the smallest image.

Second, gray-scale mode

Grayscale mode is a color mode 256, or 8-bit depth, in which the hue and saturation of the image are removed and only the brightness is left.

Three, two-tone mode

Duotone mode renders a grayscale image with a gray ink or color ink. This mode adds up to 4 colors to the grayscale image, which allows you to print images that are more interesting than simple grayscale. The advantage of Duotone mode is that the color level is reduced and the printing cost of color is reduced.

Four, indexed color mode

Indexed color images are single channel images (8 bits/pixel), using a color lookup table with 256 colors, where only limited edits can be applied, and when converted to an indexed color, Photoshop constructs a color search table that holds and indexes the colors in the image. If one of the colors in the original image does not appear in the lookup table, the program selects the closest color of the existing title table or uses the existing color to simulate the color. You can reduce the file size while maintaining visual quality unchanged.

Five, RGB mode

RGB mode: R (red) G (green) B (blue) also known as "three primary Colors" is the original color of the Sun, RGB parameter range is 0~255,

When the r=g=b=0 is black,

When the r=g=b=255 is white,

When the r=255,g=b=0 is red;

When the g=255,r=b=0 is green.

When the b=255,r=g=0 is blue

Other colors are with R, G, B, 3 color superposition and formed, a total can be superimposed out of more than 16.7 million colors, RGB color mode is the preferred mode of editing images, it is widely used, general TV, scanners, digital cameras are used in this mode.

Color	Color effectiveness	English name	Hexadecimal RGB values
Black		Black	#000000
Silver		Silver	#C0C0C0
Grey		Gray	#808080
White		White	#FFFFFF
Burgundy color		Maroon	#800000
Red		Red	#FF0000
Purple		Purple	#800080
Purplish red		Fuchsia	#FF00FF
Green		Green	#00FF00
Grass		Lime	#008000
Olive color		Olive	#808000
Yellow		Yellow	#FFFF00
Tibetan Blue		Navy	#000080
Blue		Blue	#0000FF
Black Green		Teal	#008080
Sea Blue		Cyan	#00FFFF

Six, CMYK mode:

Also known as the process color or print color, each letter represents a color, C (cyan) M (magenta) Y (yellow) K (black), C, M, Y, K parameters range of 0~100%. The RGB mode image should be converted to CMYK mode before printing. CMYK equivalent to RGB color, added a black, black role is to strengthen darkened, darker color, and more than RGB mode of information to One-fourth, so we can call it printing color or printing color.

Lab Mode

is the color between RGB and CMYK. is three through 24 for the color depth of an image mode, the scope is also more extensive, color information will not be due to the above RGB and CMYK mode of the gamut of different color loss. When the printout is printed, RGB is converted to lab and then to CMYK. L (brightness) A (from green to red) B (from blue to yellow). l:0~100 a:-120 ~ +120 b:-120 ~ +120

Eight, multi-channel mode

In multichannel mode, each channel is combined with 256 shades of gray to hold information about the color elements in the image. This pattern is used for specific printing or output. Typically includes 8 bits channel (8-bit channel) and BITS channel (16-bit channel)

Nine, HSB mode

Used with the leveling color, the parameter range is H (hue) S (saturation) B (brightness). h:0~360 s:0~100 b:0~100. H:0 is red, 60 is yellow, 120 is green, 180 is green, 240 is blue, and 300 is magenta.

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