Stenography is an increasingly used encryption procedure. It allows you to hide text (which automatically becomes encrypted text) within an image, that text in the image being totally invisible to the human eye that sees it. Thus it is impossible to detect any trace of the text in that image.
This increases the security level of the encrypted text. And this is the specific function of OutGuess, which allows you to hide information in JPG and PNM images.
Logically to re-extract the hidden information within the images you must rerun OutGuess.
You can free download OutGuess 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.