Graphics, Figures & Tables ⇒ Can TeX specify a line color in CMYK?

[Caslon Palatino]

Can TeX specify a line color in CMYK?
Steps to Reproduce
1. Declare {xcolor} package with [cmyk] color mode option.
2. Define custom color: vermillion
3. Draw line for rectangle with custom color.
BUG: Line color is black, not custom color.

Code: Select all

Code, edit and compile here:

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% File name: TitlePageBorder.tex
% LaTeX version: LaTeX2e
% TeX compiler: lualatex
% Updated: 4/2/2022
% Preamble -------------------------------------------------------
\documentclass{article}
\usepackage{geometry}
\usepackage[utf8]{inputenc}
\usepackage{graphicx}
\usepackage{fontspec} % Supports OpenType fonts (*.OTF).
\usepackage[cmyk]{xcolor}
\usepackage{tikz}
\usetikzlibrary{calc}
\geometry{paperwidth=105mm,
           paperheight=160mm,
           textwidth=216pt,   % 216pt ~=  76mm
           textheight=320pt   % 320pt ~= 113mm
         }
% Declare title font.
\newfontfamily{\MyPerpetuaTitlingMTFont}[Ligatures = {Common, Rare}]{Perpetua Titling MT} 
% Define custom color: myVermillion 
% Vermillion values at: https://www.colorhexa.com/e34234
\definecolor{myVermillion}{cmyk}{10, 90, 90, 0}
\begin{document} %  ----------------------------------------------
    \begin{titlepage}       
        \begin{center}
                            
            % Typeset title page border: rectangle. 
            \begin{tikzpicture}[overlay,remember picture]
                \draw [line width=1.5pt, color=myVermillion]
                ($ (current page.north west) + (1cm,-1cm) $)
                rectangle
                ($ (current page.south east) + (-1cm,1cm) $);           
            \end{tikzpicture}
 
 
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Run LaTeX here

[rais]

It's not a bug, you just need to rescale your values...(x)color expects values from 0 to 1 for each color channel in the cmyk model, so

Code: Select all

1
\definecolor{myVermillion}{cmyk}{0, 0.71, 0.77, 0.11}% 0% C, 71% M, 77% Y, 11% K
 
 
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should give you the original Vermillion definition...well, at least it's reddish, not black;)

KR
Rainer

[Caslon Palatino]

Many thanks, Ranier. Expressing the color percentages as decimal fractions worked. TEXstudio now draws the rectangle with the desired vermillion color.

% Define custom color.
% Vermillion values at: https://www.colorhexa.com/e34234
% NOTE XCOLOR package CMYK colors must be defined as percentages expressed in the range 0-1, where 1 = 100%.
\definecolor{myVermillion}{cmyk}{0, 0.709, 0.771, 0.11}

Sincerely yours,

Kyle