extracting pixel values from image

Hello,

I have to get the value of pure black pixel in images which hva colorbar

i have converted the range of pixels using function of thresholding and divided the image accorging.

how can i get value of highest and min value(how pure the black color is?)

like waht is the highrst value of pixels ie highest value of black color in each image?

Answer 1

[Jose Jeremias Caballero]

 a=imread('binary2.jpg'); 
imshow(a); 
minimum=min(min(a)),
 [row,column]=find(a==minimum); 
hold on,  
plot(column,row,'*'), 
hold off,

minimum =

  uint8

   88

[Smruti Khobragade]

sir i want mininum in the range 0-1 as shown in colorbar

like first pic will have pure black value as 0.8 secind image which vakue low black color will have output according to colorbar as 0.2 something

[Smruti Khobragade]

it worked .

Thankyou