CODEWITHSUNDEEP
julia
John Zicker
John Zicker

Reputation: 115

How do I convert RGB values to string hex triplet in Julia language

I am using colors.jl package and have RGB values that I need to convert to hex string triplet value. What's the best way to do this? couldn't find a conversion function in colors.jl

thanks

Upvotes: 2

Views: 788

Answers (2)

Jake Ireland
Jake Ireland

Reputation: 652

As suggested by Bogumil, Colors.jl provides the hex function:

julia> using Colors

julia> hex(RGB(1,0.5,0))
"FF8000"

Upvotes: 3

Arda Aytekin
Arda Aytekin

Reputation: 1301

You can define a custom struct which is constructible from AbstractRGB and which has the appropriate show overload as in

import Base: show
using ColorTypes

struct RGBPacked
  r::UInt8
  g::UInt8
  b::UInt8

  function (::Type{RGBPacked})(c::AbstractRGB)
    colvec  = (red(c), green(c), blue(c))
    temp    = map(UInt8, map(x->floor(255*x), colvec))
    new(temp[1], temp[2], temp[3])
  end
end

function show(io::IO, r::RGBPacked)
  print(io, "#$(hex(r.r))$(hex(r.g))$(hex(r.b))")
end

Then, you can use your custom datatype as in

c1 = RGB(1.,0.5,0.7)
c2 = RGBPacked(c1)

which prints

Main> c1 = RGB(1.,0.5,0.7)
RGB{Float64}(1.0,0.5,0.7)

Main> c2 = RGBPacked(c1)
#ff7fb2

Upvotes: 3

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