how to convert output to integer?

hi i wrote the following code for converting image to textfile but the arrays of output are hexadecimal in the textfile.how could I convert them to integer??? tnx

a= imread('D:\IP1\12.jpg');
I=rgb2gray(a);
b = I(:);
fid = fopen('D:\IP1\in2.txt');
fprintf(fid, '%x\n', b);
fclose(fid)

[Walter Roberson]

What is the difference between this question and your earlier http://uk.mathworks.com/matlabcentral/answers/246658-how-to-convert-output-to-integer ?

Answer 1

[Stephen23]

The output values are hexadecimal because that is exactly what you are telling fprintf to write:

fprintf(fid, '%x\n', b);

where the format specifier '%x' exactly means hexademical. If you want another number format, then you need to read the fprintf documentation and pick a format specifier that suits your needs: there are many options, so it is worth reading the documentation carefully. You might like to start with %d:

fprintf(fid, '%d\n', b);

More details here:

http://www.mathworks.com/help/matlab/matlab_prog/formatting-strings.html