gpick
advanced GTK+ color picker
RUN apt-get update && \
apt-get install -y gpick
RUN apt-get update && \
apt-get install -y gpick
RUN pacman -S --noconfirm gpick
RUN apt-get update && \
apt-get install -y gpick
RUN dnf install -y gpick
RUN apt-get update && \
apt-get install -y gpick