awk '
    NR==1   { for (i=1; i<=NF; i++) header[i]=$i; next; }
            { for (i=1; i<=NF; i++) total[i] += $i; }
    END     { for (i=1; i<=NF; i++) print header[i] "=" total[i]+0 }
    '

red green blue
1 2 4
8 16 32
64 128 256

red=73
green=146
blue=292