[Tex/LaTex] Smartdiagram Package: Different Fill Color in Additionals

Question

I'm using the smartdiagram package to draw a diagram, and I'm using additionals.

I would like use different fill colors for each of the additionals, but so far I couldn't figure out if this is possible.

Here is my MWE, where all the additionals are filled with gray!20

\documentclass{article}
\usepackage{tikz}
\usepackage{smartdiagram}
\usesmartdiagramlibrary{additions} 

\begin{document}

\centering
\smartdiagramset{
    set color list={red!10, red!30,red!50},
    sequence item border color=black,
    sequence item text color=black,
    sequence item border size=1.2\pgflinewidth,
    sequence item font size=\scriptsize\sffamily,
    additions={
        additional item shape=rectangle,
        additional item fill color=gray!20,
        additional item border color=black,
        additional arrow line width=2pt,
        additional arrow tip=to,
        additional arrow color=black,
        additional item font=\scriptsize\sffamily,
      }
}
\smartdiagramadd[sequence diagram]{step 1,step 2, step 3}
{above of sequence-item1/input,below of sequence-item2/output 1,below of sequence-item3/output 2}
\smartdiagramconnect{to-}{sequence-item1/additional-module1}
\smartdiagramconnect{-to}{sequence-item2/additional-module2}
\smartdiagramconnect{-to}{sequence-item3/additional-module3}

\end{document}

Is there any way of using different fill colors for annotations "input", "output 1" and "output 2"?

Answer 1

You could use a colorseries directly. For example:

\documentclass{article}
\usepackage[rgb]{xcolor}
\usepackage{tikz}
\usepackage{smartdiagram}
\usesmartdiagramlibrary{additions}
% xcolor manual: 34
\definecolorseries{colours}{hsb}{grad}[hsb]{.575,1,1}{.987,-.234,0}
\resetcolorseries[12]{colours}

\begin{document}

\centering
\smartdiagramset{
    set color list={red!10, red!30,red!50},
    sequence item border color=black,
    sequence item text color=black,
    sequence item border size=1.2\pgflinewidth,
    sequence item font size=\scriptsize\sffamily,
    additions={
        additional item shape=rectangle,
        additional item fill color=colours!!+!20,
        additional item border color=colours!!,
        additional arrow line width=2pt,
        additional arrow tip=to,
        additional arrow color=black,
        additional item font=\scriptsize\sffamily,
      }
}
\smartdiagramadd[sequence diagram]{step 1,step 2, step 3}
{above of sequence-item1/input,below of sequence-item2/output 1,below of sequence-item3/output 2}
\smartdiagramconnect{to-}{sequence-item1/additional-module1}
\smartdiagramconnect{-to}{sequence-item2/additional-module2}
\smartdiagramconnect{-to}{sequence-item3/additional-module3}

\end{document}