Color Selection [R plot] RGB color table

 

In R, plotting is done by specifying the col parameter of the plotting function, for example, par (BG = "cornsilk") # given the plotting background color x = rnorm (1000) y = cumsum (x) plot (Y, type = "L", Col = "red", xlab = "X Series ")

 

Col can assign Vectors

 

Method 1:

Use the color name, such as "Red", "green", and "Black "...

There are 657 colors available in R, which can be viewed and used through the colors () function.

 

 

CL = colors ()

 

X = runif (10000,-250,250)

Hist (x, breaks = seq (-250,250, 5), Col = Cl [])

Method 2: Use functions such as Rainbow (), heat. colors (), terrain. colors (), Topo. colors (), and CM. colors ().

 

 

 

 

 

 

Method 3: Use the function to set parameters in the color model.

(1) HCl () function

> ARGs (HCL)

Function (H = 0, c = 35, L = 85, Alpha, fixup = true)

H specifies the color, which is 0 ~ Integer between 360, 0 is red, 120 is green, 240 is blue, C is specified concentration, L is specified brightness, Alpha is specified transparency.

Example:

> X = runif (10000,-250,250)

> Hist (x, breaks = seq (-250,250, 5), Col = HCl ))

(2) HSV () function

> ARGs (HSV)

Function (H = 1, S = 1, V = 1, Gamma = 1, alpha)

Tone (H), saturation (s), brightness (V ).

Example:

> X = runif (10000,-250,250)

> Hist (x, breaks = seq (-250,250, 5), Col = HSV (SEQ (0.01,) # With seq sequence, the default saturation and brightness are 1

(3) Gray () or gray ()

 

> ARGs (Gray) function (level) Where: Level specifies the gray level, which is 0 ~ The number of one, 0 is black, and 1 is white. Example:> hist (x, breaks = seq (-250,250, 5), Col = gray (SEQ (0.01 )))

(4) RGB () function

This function specifies the color based on the three colors, red, green, and blue. RGB (r = 1, G = 0, B = 0) is red, RGB (r = 0, G = 1, B = 0) is green, RGB (r = 0, G = 0, B = 1) is blue. > ARGs (RGB) function (red, green, blue, Alpha, names = NULL, maxcolorvalue = 1)

When maxcolorvalue (max) is set to 255, RGB can be from 1 ~ 255 changes. It is consistent with the query value of the color table.

> Hist (x, breaks = seq (-250,250, 5), Col = RGB (r = 1, G = 0, B = 0 ))

Method 4: color gradient methods

(1) colorramp {grdevices} # colorramp function in the grdevices package

Example 1:

Ramp <-colorramp (C ("red", "White "))

RGB (ramp (SEQ (0, 1, length = 5), max = 255)

Example 2:

RGB. palette <-colorramppalette (C (RGB (35,179,225, max = 255), RGB (255, 24, 21, max = 247,236), RGB (255, 0, max = )), space = "RGB") # yellow, black, and blue

# RGB. palette <-colorramppalette (C (RGB (230,247,255, max = 255), RGB (35,179,225, max = 255), Space = "RGB") # blue gradient

 

RGB. palette (10)

 

Some color-related functions are attached:

 

> Rgb2hsv (255,255,255) # Convert RGB to HSV [, 1] H 0 s 0 V 1

 

 

>. Internal (rgb256 (0,255, 0,255, null) # Check the hexadecimal value of RGB [1] "# 00ff00ff"

 

 

 

You can find some nice colors by attaching the RGB color table:

 

RGB color table

Http://www.cnblogs.com/xianghang123/archive/2012/06/13/2547604.html

 

[Update]

Online color palette ~~ Easier Color Matching

Http://www.361dh.com/cx/yanse.htm