Image Pixel values

Question

I want to get a decimal values of pixel of certain grayscale image but here i require say decimal values of first 20 pixel only..(1,1) to (1,20)

I know there is pixval c

Answer 1

In MATLAB, an image is just a matrix. So accessing pixels is the same as accessing matrix elements.

For example:

im = imread('someimage.jpg');

firstrow = im(1,:);
firstcol = im(:,1);
first20pixels = im(1:20);

I have no idea what you mean by "need adjustment of mouse over image".