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 Debian possible default full paths are:

/usr/bin/RGBtoBMP - from package: dirac

You may install the required package with command apt-get install {package}

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