Error not reported

[CarLaTeX]

I would like to show you this MWE:

\documentclass{article}
\usepackage{xcolor}
\colorlet{orangething}{orange!120}

\begin{document}
\color{orangething}{does not give erros}

\color{orange!120}{gives error}
\end{document}

The first line does not give errors, whereas the second one correctly gives ! Package color Error: Argument '-0.3' not in range [0,1].

See also https://tex.stackexchange.com/questions/653210/how-do-you-go-over-the-0-1-range-for-colors.

Thank you, bye! Carla

[u-fischer]

As the error message says, the error is from the color package (or more precisely from the driver in graphics-def) and not from xcolor. xcolor itself tries in many cases to catch faulty arguments and to correct them. So \definecolor{funny}{rgb}{3, 0.5,-0.6} works and is truncated to 1 0.5 0. The color package would error with it.

So extending the error messages is imho against the main spirit of xcolor but one could suppress rather easily the suppress it in this case:

\documentclass{article}
\usepackage{xcolor}
\begin{document}
\makeatletter

\def\@xcolor@@#1!#2!#3!#4!#5\@nil
 {\dimen@\@ifxempty{#1}{100}{#1}\p@
  \edef\@@mix{\@ifxempty{#2}{white}{#2}}%
  \ifdim\dimen@>100\p@ \dimen@=100\p@ \fi %new
  \ifdim\dimen@=100\p@
    \expandafter\XC@postfix\@@mix]\relax
  \else\ifdim\dimen@=\z@
    \extractcolorspecs\@@mix\@@mod\@@clr
  \else
    \XC@let@Nc\@@tmp{XC@clr@\@@mod @\@@mix}%
    \ifx\@@tmp\relax
      \extractcolorspec\@@mix\@@tmp
      \ifx\@@mod\XC@mod@gray
        \edef\@@mod{\expandafter\@firstoftwo\@@tmp}%
        \edef\@@tmp{\expandafter\@secondoftwo\@@tmp}%
        \convertcolorspec\XC@mod@gray\@@clr\@@mod\@@clr
      \else
        \expandafter\convertcolorspec\@@tmp\@@mod\@@tmp
      \fi
    \else
      \ifx\@@mod\XC@mod@hsb\expandafter\XC@extract@hue\@@clr:\@@hue\fi
    \fi
    \XC@inflate\@@mod\@@clr\@@tmp\@@tmp
    \expandafter\XC@mix\@@tmp,\@@clr
  \fi\fi
  \@ifxempty{#3}%
   {\@ifxempty{#4}{}{\@xcolor@@!#4!#5\@nil}}%
   {\@xcolor@@#3!#4!#5\@nil}}

\makeatother
\color{orange}     orange 

\color{orange!120} orange

\colorlet{orangething}{orange!120}

\color{orangething} orange

\end{document}

(\color[rgb]{3, 0.5,-0.6} blub would still error as this is passed more or less unchanged to the driver).

[CarLaTeX]

Ok, thank you, Ulrike, ciao!

Il giorno lun 8 ago 2022 alle ore 09:31 Ulrike Fischer < @.***> ha scritto:

As the error message says, the error is from the color package (or more precisely from the driver in graphics-def) and not from xcolor. xcolor itself tries in many cases to catch faulty arguments and to correct them. So \definecolor{funny}{rgb}{3, 0.5,-0.6} works and is truncated to 1 0.5 0 . The color package would error with it.

So extending the error messages is imho against the main spirit of xcolor but one could suppress rather easily the suppress it in this case:

\documentclass{article} \usepackage{xcolor} \begin{document} \makeatletter

@.@@@. {\dimen@@.{#1}{100}{#1}\p@ \edef\@@@.{#2}{white}{#2}}% \ifdim\dimen@>100\p@ \dimen@=100\p@ \fi %new \ifdim\dimen@=100\p@ @.\@@mix]\relax \else\ifdim\dimen@=\z@ \extractcolorspecs\@@mix\@@mod\@@clr \else @.@Nc\@@@.@\@@mod @\@@mix}% \ifx\@@tmp\relax \extractcolorspec\@@mix\@@tmp \ifx\@@@.@gray \edef\@@@.\@@tmp}% \edef\@@@.\@@tmp}% @.@gray\@@clr\@@mod\@@clr \else \expandafter\convertcolorspec\@@tmp\@@mod\@@tmp \fi \else \ifx\@@@.@@.@hue\@@clr:\@@hue\fi \fi @.\@@mod\@@clr\@@tmp\@@tmp @.\@@tmp,\@@clr \fi\fi @.{#3}% @.**@.@@@.}}% @.@@@.***}}

\makeatother \color{orange} orange

\color{orange!120} orange

\colorlet{orangething}{orange!120}

\color{orangething} orange

\end{document}

(\color[rgb]{3, 0.5,-0.6} blub would still error as this is passed more or less unchanged to the driver).

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