Photoshop is a computer tool used for editing images, often so the editor can claim they are real when the image is actually fabricated.
Photoshopping a captcha is the greatest sin against Inglip, and attempts to do so will end with a swift and certain death to the editor.
Despite this, many photoshopped captchas have become canon, most notably the original summoning of Inglip. In this case, the perpetrator may be excused of his crimes. Other forgiven examples of photoshopped-yet-allowed captchas can be seen on Inglip's sub-reddit. This can be assumed to be because the true meaning of Inglip's words are more easily understandable when put into certain forms. This does not mean, however, that photoshopping captchas is allowed.