[Solved] Finding a steganography message

If you had a steganography image that you knew contained a hidden message, but had no idea how it was put into the image, how would you go about extracting the message or is it impossible?

Yes you can find the message. search for steganalysis and destegging

https://uk.sans.org/reading-room/whitepapers/stenganography/steganalysis-detecting-hidden-information-computer-forensic-analysis-1014

http://www.unfiction.com/dev/tutorial/steg.html