tiffset: 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/tiffset - from package: libtiff

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

On Debian possible default full paths are:

/usr/bin/tiffset - from package: libtiff-tools

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

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