I want to change my original intensity/gray-scale image into wcodemat for wavelet transform but problem is if i use
Y = wcodemat(X)
the image just turn into different shades of blue and this doesn't represent the original image(which is black and grey), I also cannot use
Y = wcodemat(X,NBCODES), because my image doesn't have map which is required for the NBCODES parameter.
How can I resolve this problem?