how to save an double image with no changing in matlab?

hi i am working on image steganography project and my problem is that after hiding the message in image my image became double and when i save it as jpeg or png or tiff the data value changes. but when i save it by matlab tiff class i can extract the correct data but the image can not be seen on computer and no program can not open the image.is there a solution to this problem?

Answer 1

[Image Analyst]

Cast it to uint8 before saving. Of course the data will change slightly. Whether your recovery algorithm can still get out a "good enough" image to interpret depends on how robust your recovery algorithm is.