`Gray` color model broken

[SFr682k]

Current behavior

Each of the following snippets fails with “Illegal unit of measure (pt inserted)” and “Missing number, treated as zero” errors.

Snippet 1 (Log file):

\documentclass{article}
\usepackage{xcolor}
\begin{document}
    \selectcolormodel{Gray}
    \definecolor{SomeColor}{Gray}{12}

    Hello World!
\end{document}

Snippet 2 (Log file):

\documentclass{article}
\usepackage{xcolor}
\begin{document}
    \selectcolormodel{Gray}
    \definecolor{SomeColor}{gray}{0.50}

    Hello World!
\end{document}

Snippet 3 (Log file)

\documentclass{article}
\usepackage{xcolor}
\begin{document}
    \selectcolormodel{Gray}

    \color{red}
    Hello World!
\end{document}

Expected behavior

The Gray color model “just works”

Environment

• TeX Live 2022
• pdflatex 2022.6.25, pdftex v1.40.24
• xcolor 2022/06/12 v2.14

[u-fischer]

yes. A quite old bug. Happily the hycolor package contains a patch (https://tex.stackexchange.com/a/520379/2388). I will move it to xcolor, but for now you can load it directly (or load hyperref).

\documentclass{article}
\usepackage{xcolor}
\usepackage{xcolor-patch}
\begin{document}
    \selectcolormodel{Gray}
    \definecolor{SomeColor}{gray}{0.50}

    Hello World!
\end{document}

[u-fischer]

This has been fixed in version 3.00