The medium who was a crook insisted that he completed the exorcism, but all he did was remove the ghost from the picture by editing it on his computer.
この場合、次のような言い方ができますよ。
ーThe medium who was a crook insisted that he completed the exorcism, but all he did was remove the ghost from the picture by editing it on his computer.
「詐欺霊媒師は除霊をしたと言い張ったが、彼はパソコンで写真を修正し幽霊を取り除いただけだった」
medium「霊媒師」
crook「詐欺師」
exorcism「除霊・悪魔払い」
to remove「取り除く」
to edit「編集する・修正する」
ご参考まで！
カナダ 
