Usamos tcolorboxun tono degradado con un solo color que es porcentajes de gris a blanco, verificamos la salida en PDF y el color muestra colores mezclados CMYK. ¿Mi codificación TeX es correcta?
\documentclass{book}
\usepackage{tcolorbox}
\tcbuselibrary{skins}
\makeatletter%
\pagestyle{empty}
\definecolor{boxonegradbegin}{cmyk}{0,0,0,0.10}%
\newtcolorbox{gradientbox}[1][]{%
enhanced,boxrule=0pt,boxsep=0pt,sharp corners,
frame hidden,interior style={left color=boxonegradbegin,right color=white},
#1
}
\makeatother%
\begin{document}
\begin{gradientbox}
The Strati resulted from the 3D Printed Car Design Challenge, conducted using crowd-sourcing technologies by Local Motors, which is based in Phoenix, Arizona. The company believes it is at the forefront of the 3D Industrial Revolution and describes itself as a free online and physical workspace that enables people to turn their vehicle innovations into reality and rewards them for their contribution. The key issues discussed in the brief for the design challenge were as follows.
\end{gradientbox}
\end{document}