Saved image is different when read in matlab -


i created matrix using calculation.i saved in bmp format.but when reading in matlab,the content of changes totally.only value 0 correct.all other pixels having values 255enter image description here.why this.how solve this?? showing image correctly when imsec command used

 i=1:length(pixel_matrix)      pixel=char(pixel_matrix(i));      r=7;       pixel_value=0;      j=1:4          s=r-1;          if(pixel(j)=='a')              temp_bin=0;          elseif(pixel(j)=='b')              temp_bin=(2^r)+(2^s);          elseif(pixel(j)=='c')              temp_bin=(2^s);          elseif(pixel(j)=='d')              temp_bin=(2^r);          end       pixel_value=pixel_value+temp_bin;      r=r-2;        end      pixel_row(i)=pixel_value;  end    i=1;  j=1;  m=1:length(pixel_row)       pixel_value(i,j)=pixel_row(m);      j=j+1;      if(j==65)          i=i+1;          j=1;      end      end       i=1:64          j=1:64              picture(i,j)=uint8(pixel_value(i,j));          end  end   imwrite(picture,'c:\users\xxx\desktop\pic.bmp');   aaaa=imread('c:\users\xxx\desktop\pic.bmp');

the problem filling picture uint8 values, when not specified otherwise, images in matlab doubles between 0 , 1. try using map option imwrite or norm values of pixel_value(i,j) fit them between 0 , 1 this:

%...  i=1:64      j=1:64          picture(i,j)=pixel_value(i,j)/255; %<- norm things here...      end  end

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