\documentclass{article}

\errorcontextlines=99999
\usepackage{fancyqr}

\usepackage[active,tightpage]{preview}
\setlength\PreviewBorder{50pt}
\usepackage{pgffor}

\makeatletter
% make all black:
\def\qr@white{1}
\begin{document}
\preview
\foreach \i in {0,.1,...,1}{%
\expandafter\FancyQrDoNotPrintRadius\expandafter{\i}%
\fancyqr[classic,image=\Large\color{green}@,level=H,version=10]{https://github.com/EagleoutIce/fancyqr}\hfill
\fancyqr[classic,image=\Large\color{purple}*\fpeval{round(\i,2)}*,level=H,version=10]{https://github.com/EagleoutIce/fancyqr}\hfill
}\\
\centerline{Various Variants of \texttt{\textbackslash FancyQrDoNotPrintRadius}}
\endpreview
\end{document}