help in dwt water marke

Error using reshape To RESHAPE the number of elements must not change.

Error in Untitled (line 17) message_vector=round(reshape(message,Mm*Nm,1)./256);

Answer 1

[Walter Roberson]

Whatever your Mm and Nm are, they do not multiply out to numel(message)

You should compare numel(message) to Mm * Nm