How to change selected pixels color value to 0?

Hello,

I need to select pixels interactively from the image and change values to 0.

[filename, pathname] = uigetfile({'*.*';'*.bmp';'*.png';'*.jpg';'*.gif'}, 'Pasirinkite faila');
Image = imread([pathname,filename]);

pval=impixel(Image);

This way I can see selected pixels values:

pval =

   231    71   115
   207     0    70
   249    12    84
   115    32    42

How can I change those exact values to zero?

The point is to change selected color to black.

Thanks for your help!

Answer 1

[Chunru]

% Get an indexed image
Im = imread("peppers.png");
[Im, cmap] = rgb2ind(Im, 256);
%whos

  Name          Size              Bytes  Class     Attributes

  Im          384x512            196608  uint8               
  cmap        256x3                6144  double              
  cmdout        1x33                 66  char                

pval = [
   231    71   115
   207     0    70
   249    12    84
   115    32    42];
for i=1:numel(pval)
    Im(Im==pval(i)) = 0;
end
imshow(Im, cmap)