MATLAB: After division i am getting 1 as the answer

image analysisImage Processing Toolbox

editor:
f1=input('Enter a image name:','s');
a1=imread(f1);
c1=rgb2gray(imresize(a1,[3,9]))';
N=[208    16   235   255    44   229   236    34   247;...
    245    21   213   254    55   252   215    51   249;...
    248    22   225   252    30   240   242    27   244]';
N=N/256
c2=c1/256
Command window: Enter a image name:51.jpg
N =
    0.8125    0.9570    0.9688
    0.0625    0.0820    0.0859
    0.9180    0.8320    0.8789
    0.9961    0.9922    0.9844
    0.1719    0.2148    0.1172
    0.8945    0.9844    0.9375
    0.9219    0.8398    0.9453
    0.1328    0.1992    0.1055
    0.9648    0.9727    0.9531
c2 =
    1    1    1
    1    1    1
    1    1    1
    1    1    1
    1    1    1
    1    1    1
    1    1    1
    1    1    1
    1    1    1
>>

Best Answer

Cast c1 to double so that you're not doing an integer divide, but doing a floating point divide instead:
c2 = double(c1) / 256;
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