How do i convert a bmp or jpeg image to a hexadecimal

b=imread('frog in the rain.bmp'); % 24-bit BMP image RGB888

k=1;

for i=721:-1:1 % image is written from the last row to the first row

for j=1:481

a(k)=b(i,j,1);

a(k+1)=b(i,j,2);

a(k+2)=b(i,j,3);

k=k+3;

end

end

fid = fopen('frog in the rain.hex', 'wt');

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

disp('Text file write done');disp(' ');

fclose(fid);

Error using imread>get_full_filename (line 568)

File "frog in the rain.bmp" does not exist.

Error in imread (line 377)

fullname = get_full_filename(filename);

[Walter Roberson]

The problem is on the first line. You do not have a file named 'frog in the rain.bmp' in the current directory or anywhere on the MATLAB path. Consider adding the full path including the directory name.

Answer 1

[Image Analyst]

See my attached demo. Change %d to %x and it should write out the location and values to a list in a text file.