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This plugin encrypts an image inside another image in a secure way and with a small reduction in quality thanks to a powerful dithering method, the only way to extract the image is with a use of a password. Download ImageSteganographyTool.zip Installation The archive contains the plugin file, it can be installed by running the .bat file or manually dropping the .dll file into the PaintNet\Effects\ folder Instructions How to Encrypt. Open the image you want to cover. Open the image steganography tool(it is located in the Effects drop down menu) Choose a key, by adjusting the 3 key sliders (this is like a password, without this you want be able to decrypt the image later) Select "Encrypt image". Click on the folder icon to select an image to cover the original image. Select quality, this will affect the quality of both images.(the default quality 4-bit & 4-bit is the most balanced option offering great quality for both images) Click OK and you are done! When saving the image it is important to use a lossless format like PNG PDN BMP etc. How to Decrypt. Open the image you want to decrypt, in order to reveal the original image. Open the image steganography tool(it is located in the Effects drop down menu) Insert the CORRECT key, by adjusting the 3 key sliders. Select "Decrypt image". Select quality option.(you must choose the same quality option that was used when the image was Encrypted) Click OK and you are done! Examples Using the "Original image 6-bit - Cuver image 2-bit" quality option. Using the "Original image 4-bit - Cuver image 4-bit" quality option.

@NetDotPaint The plugin's page at https://forums.getpaint.net/topic/114600-image-distortion/ contains a note saying where you need to put the OptionBasedLibrary files and there is further discussion of this in the thread. I've edited the note to make it bolder now.

That's why it's not working; the plugin files (and dependencies) need to be placed within the Effects folder.

Just found the solution, use Effects > Noise > Median. Cheers