Mean of hexadecimal numbers
grDevices has `convertColor()` and the `colorspace` has other functions that can convert from RBG to Lab space. You should convert the RGB colors to Lab and average them that way (or us other functions to convert to HSL or HSV). It all depends on what you are trying to accomplish with the "average" color determination. -Bob On Sat, Apr 16, 2016 at 12:03 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
On 16/04/2016 8:47 AM, Atte Tenkanen wrote:
Hi,
How would you calculate the "mean colour" of several colours, for
example c("#FF7C00","#00BF40","#FFFF00")?
Bert answered your subject line question. Your text is asking something
else: if those are colours, you don't want to treat each of them as a
single integer.
A simple-minded approach would split them into 3 hex numbers, and average
those (using Bert's solution).
A more sophisticated approach would take into account that they are really
colours. You could probably put together something using the colorRamp or
colorRampPalette functions to average in perception space. For example,
# Average the 1st two by taking the middle colour of a 3 colour palette
x <- colorRampPalette(c("#FF7C00","#00BF40"), space = "Lab")(3)[2]
# Average in the third by taking the 2nd of a 4 colour palette, so x
# gets twice the weight
colorRampPalette(c(x, "#FFFF00"), space = "Lab")(4)[2]
Duncan Murdoch
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