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.
