I'm mostly disturbed by the sentence "Since Photoshop is a trademark, you should always use it as an adjective only to describe the Adobe products associated with the Photoshop brand.", as Photoshop is clearly a noun.
> Trademarks are proper adjectives and should be followed by the generic terms they describe.
> Correct: The image was manipulated using Adobe® Photoshop® software.
> Incorrect: The image was manipulated using Photoshop.
Adobe's own marketing pages consistently use the ostensibly "incorrect" usage though: http://www.adobe.com/au/products/photoshop.html
[0] https://en.wikipedia.org/wiki/Telephone_numbers_in_Australia
Correct: The image was enhanced with Adobe® Photoshop® Elements software.
Incorrect: The image was photoshopped.