MATLAB Answers

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

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Gayathri Aiswarya
Gayathri Aiswarya on 20 Apr 2019
Answered: Image Analyst on 20 Apr 2019
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);

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Walter Roberson
Walter Roberson on 20 Apr 2019
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.

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Answers (1)

Image Analyst
Image Analyst on 20 Apr 2019
See my attached demo. Change %d to %x and it should write out the location and values to a list in a text file.

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