Making watermark Using LSB algorithm this program in matlab We use OPAP Algorithm to Extract the Secret image program is very Simple and easy for use How i can using : install matlab run matlab open file Gui0.m and run it enjoy if program make crach : ther is becouse function caled de2bi() %this function to convert from decimal to binary% this problem happend because the function doesn't exist in your matlab toolbox To solve it: search about problem in mr.Google this program build by @moroclash