I saw i paper a long time ago of a stenography quite resistant to transformations so the basic information was still extractable from the picture. Still i think

I saw i paper a long time ago of a stenography quite resistant to transformations so the basic information was still extractable from the picture. Still i think that a photograph of the monitor would remove it. EDIT: Even a photo filter might not succeed if it did a homogenous effect across the pixels. I have to find that algorithm someday.