dirac_RGBtoBMP: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On CentOS possible default full paths are:

/usr/bin/dirac_RGBtoBMP - from package: dirac

You may install the required package with command yum install {package}

Error in other languages:
dirac_RGBtoBMP: bevel nie gevind nie
dirac_RGBtoBMP: comandă negăsită
dirac_RGBtoBMP: comando não encontrado
dirac_RGBtoBMP: commande introuvable
dirac_RGBtoBMP: command not found
dirac_RGBtoBMP: käsku ei ole
dirac_RGBtoBMP: không tìm thấy lệnh
dirac_RGBtoBMP: komanda nerasta
dirac_RGBtoBMP: Kommando nicht gefunden.
dirac_RGBtoBMP: kommandot finns inte
dirac_RGBtoBMP: komut yok
dirac_RGBtoBMP: nie znaleziono polecenia
dirac_RGBtoBMP: níor aimsíodh an t-ordú
dirac_RGBtoBMP: no se encontró la orden
dirac_RGBtoBMP: no s'ha trobat l'ordre
dirac_RGBtoBMP: opdracht niet gevonden
dirac_RGBtoBMP: parancs nem található
dirac_RGBtoBMP: perintah tidak ditemukan
dirac_RGBtoBMP: príkaz nenájdený
dirac_RGBtoBMP: příkaz nenalezen
dirac_RGBtoBMP: команда не найдена
dirac_RGBtoBMP: командата не е открита
dirac_RGBtoBMP: 命令找不到
dirac_RGBtoBMP: コマンドが見つかりません