It is photoshopped.
Another Answer
NB: Photoshop(R) is a brand name, a trade name, a Registered Trademark for a software product. Turning nouns like this into verbs could be equated with lazy writing.
One could write:
"The image had been worked over by Photoshop(R)."
That would give you the past tense version you want, and a more proper use of the word Photoshop(R).
It should be noted that Adobe do not accept its usage as a verb as stated in their guidelines. Thus, the above answer should be taken into account for any academic writing you are undertaking.
See the related links for more information.
the past tense of am is was and the past tense of has is had
The past tense of "has" is "had" and the past tense of "have" is "had."
Was and were are both the past tense of be. The present tense is: I am he is you are they are The past tense is: I was he was you were they were
"will be" is the future tense of "be". The past tense of "be" is "was/were".
The past tense of "she do" is "she did."
The word "were" is past tense. It is the past tense of the verb "to be."
The past tense of "will" is "would" and the past tense of "be" is "was" or "were" depending on the subject (singular or plural).
HAD is the Past Tense of TO HAVE.
The past tense of "am" is "was" and the past perfect tense of "has" is "had."
The past tense of "have" is "had."
The past tense of "you will not" is "you would not."
The past tense of "exist" is "existed." The past perfect tense is "had existed."