RGB circle by ImageMagick

RGBcircle.sh

convert  -size 1024x1024 -background transparent xc:  -compose lighten \
        \( xc: -draw "fill red    circle 512,350,512,650" \) -composite \
        \( xc: -draw "fill green2 circle 324,650,324,950" \) -composite \
        \( xc: -draw "fill blue1  circle 676,650,676,950" \) -composite \
        -font KaiseiDecol-Regular.ttf +gravity -pointsize 256 -fill black -stroke black -strokewidth 18 \
        -draw "text 420,320  R"  \
        -draw "rotate -10 text -20,850 G" \
        -draw "fill white stroke white rotate 25 text 940,410 B" \
        RGB.png ;