How can I convert jpg file to pbm file through only matrix operation?-CodePudding

I have tried the method as follows, but it didn't work so efficient.

for i = 1:h 
            for j = 1:w 
                Img(1,(i-1)*aligned_w j) = (Matrix(i,j)&1);
                %fwrite(file,1-Matrix(i,j),'ubit1');
            end
            for j = 1:align
                %fwrite(file,0,'ubit1');
                Img(1,(i-1)*aligned_w w j)=0;
            end
        end
        fwrite(file,Img,'ubit1');

the result of above code is off track compared to the imwrite(imread('.jpg','jpg'),'.pbm','pbm'), can anyone tell me how to solve it.

CodePudding user response：

I'm found the solution, the reason is that Matrix should be a whchannel matrix, the format (i,j) should be replaced into (i,j,channel), where channel from 1 to 3. And the result should be the three expression under or operation.