Suppose I have this color in HEX values (including alpha):

x <- "#FF2400FF"

Is there a neat package to convert HEX values to RGB values in R? Or a simple bit of code to do that?

[#1] c("36 0 255")

Edit: This is the opposite way of RGB to Hex converter question

4 Answers

Based on the comments already given, you can use this code:

x <- "#FF2400FF" paste(as.vector(col2rgb(x)), collapse = " ") #> [1] "255 36 0" 

However, looking at your requested result, it seems that you have the alpha-value as first hex-number in your x - so you need to create a substring:

x <- "#FF2400FF" paste(as.vector(col2rgb(paste0("#", substr(x, 4, 10)))), collapse = " ") #> [1] "36 0 255" 

Example 1

You can get the RGB values as a 1-dimensional array

hex.rgba.color <- "#FF2400FF" rgb.array <- col2rgb( hex.rgba.color ) print( rgb.array ) 

Output

 [,1] red 255 green 36 blue 0 

Example 2

You can get the red, green, and blue values respectively as integers

hex.rgba.color <- "#FF2400FF" rgb.array <- col2rgb( hex.rgba.color ) message( rgb.array[1] ) # red message( rgb.array[2] ) # green message( rgb.array[3] ) # blue 

Output

255 36 0 

Example 3

You can also get the alpha value as integer by simply adding alpha=TRUE

hex.rgba.color <- "#FF2400FF" rgba.array <- col2rgb( hex.rgba.color, alpha=TRUE ) message( rgba.array[1] ) # red message( rgba.array[2] ) # green message( rgba.array[3] ) # blue message( rgba.array[4] ) # alpha 

Output

255 36 0 255 

Example 4

You can get all the values as vector by typecasting the array with as.vector()

hex.rgba.color <- "#FF2400FF" rgba.vector <- as.vector( col2rgb( hex.rgba.color, alpha=TRUE ) ) print( rgba.vector ) 

Output

[1] 255 36 0 255 

With this code, HEX colors strings are splitted and converted to integers:

for (color in heat.colors(10)) { hex_splitted_color = c(paste('0x', substr(color, 4, 5), sep = ''), paste('0x', substr(color, 6, 7), sep = ''), paste('0x', substr(color, 8, 9), sep = '')) print(strtoi(hex_splitted_color)) } [1] 0 0 255 [1] 36 0 255 [1] 73 0 255 [1] 109 0 255 [1] 146 0 255 [1] 182 0 255 [1] 219 0 255 [1] 255 0 255 [1] 255 64 255 [1] 255 191 255 

As @Cath commented, it exists a function to do that:

col2rgb(heat.colors(10)) [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] red 255 255 255 255 255 255 255 255 255 255 green 0 36 73 109 146 182 219 255 255 255 blue 0 0 0 0 0 0 0 0 64 191