EDIT: after finding the old research on PixelKnot, I can confirm that this image is missing the hexadecimal finger print.

Also, if you change or convert an image with an encoded PixelKnot message, the message will be unrecoverable (due to the JPG compression and Fourier Transforms work).

Hope that saves you time.

Jpg is a lossy compression ... i.e. you will lose data converting a bmp into it. Try using a png instead.