what's wrong with this code, when i'm trying to read the 3 channels of each frame of the video

while i'm reading an RGB video, i wanted to extract for each frame its 3 channels? BUT here results looks weird, any one can Explain to me the reason is? here there is the code i used:

videoReader = vision.VideoFileReader('video3.avi');
J=0;
while ~isDone(videoReader);
    J=J+1
    frameRGB = step(videoReader); 
    figure,imshow(frameRGB(:,:,1));
    figure,imshow(frameRGB(:,:,2));
    figure,imshow(frameRGB(:,:,3));
end

and here there is the three channels extracted:

[John BG]

please hang the original image in this blog .0 imshow shows 1 layer only input as Black&White. You feed RGB layers and you are seeing the grading of each primary colour, but see the grading in grey, not RGB respectively. Or perhaps your input is Black & White and we, the readers, don't know yet.

Answer 1

[Walter Roberson]

videoReader = vision.VideoFileReader('video3.avi');

fred = figure();
axred = axes('Parent', fred);
fgreen = figure();
axgreen = axes('Parent', fgreen);
fblue = figure();
axblue = axes('Parent', fblue);

J=0;

while ~isDone(videoReader);
    J=J+1
    frameRGB = step(videoReader); 

      imgR = frameRGB;
      imgR(:,:,2:3) = 0;
      imshow(imgR, 'Parent', axred); title(axred, 'Red pane');

      imgG = frameRGB;
      imgG(:,:,[1 3]) = 0;
      imshow(imgG, 'Parent', axgreen); title(axgreen, 'Green pane');

      imgB = frameRGB;
      imgB(:,:,1:2) = 0;
      imshow(imgB, 'Parent', axblue); title(axblue, 'Blue pane');

      drawnow();
  end