Steganography in PNG images

[Hesam]

Hi,

for my project, I need to know can i manipulate bits of PNG format images?
i want to put text inside picture.

which classes are suitable for me?

Thanks

[rahulvala]

Have you seen the QPixmap class it changes the size of the image and set according to the mobile pixel.
http://wiki.forum.nokia.com/index.ph..._QPixmap_image

I think you can not directly calculate the pixel, you have to find out the width and height from the image and then calculate the pixel.

About your second question open your image in the paint and modify by your own way.

regards,
RahuL

[Hesam]

Thank you rahulvala,

Actually I don't want to set image. Assume that I have a image. now I want to hide my textual information inside the picture (Steganography).

To do this, I have to change 2LSB of each byte of a pixel (RGB). I checked your link it was useful for me because in "Detailed Description", it has written that "QImage is designed and optimized for I/O, and for direct pixel access and manipulation".

Thanks again

[danhicksbyron]

To do what you want you have to decode the PNG format and figure out where the LSBs are. And PNG is a much harder format to crack than most others, from what I've heard. Not even clear that steganography is practical on PNG, due to the way it works.