Laserschwert said:

Trademarks are not verbs.

Correct: The image was enhanced using Adobe® Photoshop® software.
Incorrect: The image was photoshopped.

Trademarks are not nouns.

Correct: The image pokes fun at the Senator.
Incorrect: The photoshop pokes fun at the Senator.

Always capitalize and use trademarks in their correct form.

Correct: The image was enhanced with Adobe® Photoshop® Elements software.
Incorrect: The image was photoshopped.
Incorrect: The image was Photoshopped.
Incorrect: The image was Adobe® Photoshopped.

I fully agree with this. That's why I use JASC Corel Paintshop Pro. instead.