have a excel file having (amplitude) data at each cell, that is being converted to a coloured image and when I select an area in the image, it should give back corresponding amplitude value.

clc
clear
% take data frm xcl and look for selected area
Amp=xlsread('C:\Users\AMIT\Desktop\CB\excel\4\Cast Billet Amp Data-(4-5).xls');
Th=xlsread('C:\Users\AMIT\Desktop\CB\excel\4\Cast Billet thickness Data-(4-5).xls');

Z=Amp(2:1:514,2:1:256);
T=Th(2:1:514,2:1:256);

for i=1:1:513
    for j=1:1:255
            if ((Z(i,j)>=80) && (Z(i,j)<=100)) % selecting high amp regions
              A(i,j)=Z(i,j);
              B(i,j)=T(i,j);
            else
                A(i,j)=0;
              B(i,j)=0;
            end
    end
end

for i=1:1:513
    for j=125:1:225

         C(i,j)= A(i,j);
        D(i,j)= B(i,j);

    end
  end

axes('FontSize',20);
image(A');figure
axes('FontSize',20);
imagesc(B');figure

for i=1:1:513
    for j=125:1:225
            if B(i,j)>=6.5 && B(i,j)<=7.0
              A4(i,j)=C(i,j);
               else
                A4(i,j)=0;
              end
    end
end

axes('FontSize',20);

%imagesc(Y,X,A4');figure
imagesc(A4');figure
ylim([120 225])
% I'll select an area of red region then I should get the amplitude values ..