It is rather difficult for me (or anybody else) to type something like this:
"The image was enhanced using Adobe® Photoshop® software."
It is so much easier to write and read:
"The image was photoshopped."
But trademark owners would never see the reason. Therefore they say:
The Photoshop trademark must never be used as a common verb or as a noun. The Photoshop trademark should always be capitalised and should never be used in possessive form, or as a slang term. It should be used as an adjective to describe the product, and should never be used in abbreviated form.Moreover, those '®' symbols do not always display properly.
For all their gyaan, Adobe uses 'photoshop' as a verb on their own site: