Filesize Problem

I am using a .tiff image for LSB based steganography. The method works fie but the problem is that even if I embed a 2 byte message in a 43.2 KB image, when I write back the altered image matrix to a new file using imwrite(), the size of the new file gets abruptly increased to 673KB. Can you please help me out on this?

[Walter Roberson]

If you write back the file without any change, what size shows up?

[Jan]

Which parameters do you use for IMWRITE?

Answer 1

[Image Analyst]

What application created the TIFF file? There are different "flavors" of TIFF files and MATLAB probably doesn't use all the same tags as your input image. It could very well use different tags, which would give rise to a different file size.